18 Other Ways to Say Difficult (With Examples & Usage Tips)

“Difficult” covers everything from a hard exam to a heavy box — which is exactly the problem. English has sharper synonyms for difficult: some describe effort (arduous), others describe complexity (complex), and a few carry real attitude (daunting).

Below are 18 precise alternatives to “difficult”, each with its exact meaning, when to use it, when to avoid it, and natural examples. This guide is part of SpellDict‘s vocabulary series — see also our guides to synonyms for change, synonyms for explain, and synonyms for positive.

18 Different Ways to Say Difficult

1. Hard

Meaning: Not easy to do or understand; requires effort.
Use it when: speaking generally and casually — it fits almost anywhere.
Avoid it when: you need precision — hard is vague, and it also means “solid”.

• The exam was really hard.
• It is hard to hear you with this noise.
• Learning a new language is hard at first.

2. Tough

Meaning: Demanding; requiring strength or endurance.
Use it when: describing decisions, times, or situations that test you.
Avoid it when: describing purely intellectual puzzles — tough is about endurance.

• It was a tough decision to make.
• She had a tough day at work.
• The interview asked tough questions.

3. Challenging

Meaning: Testing your ability in a stimulating, positive way.
Use it when: describing difficulty that brings growth and reward.
Avoid it when: the situation is simply miserable — challenging carries a positive tone.

• The new job is challenging but fun.
• It was a challenging climb to the top.
• She enjoys challenging puzzles.

4. Complicated

Meaning: Having many parts that are hard to follow or solve.
Use it when: describing processes, instructions, or situations with tangled details.
Avoid it when: describing physical effort — complicated is about parts, not sweat.

• The instructions were too complicated.
• Our travel plans got complicated.
• It is a complicated recipe with many steps.

5. Complex

Meaning: Made of many connected parts; hard to fully understand.
Use it when: describing systems, ideas, or problems with deep structure.
Avoid it when: talking very casually — complex is slightly formal.

• The legal issue is more complex than it looks.
• He explained the complex theory simply.
• The human brain is incredibly complex.

6. Demanding

Meaning: Requiring a lot of effort, skill, or attention.
Use it when: describing jobs, bosses, schedules, or courses.
Avoid it when: describing a one-off task — demanding implies ongoing pressure.

• Being a doctor is a demanding job.
• The course is very demanding.
• She has a demanding schedule this week.

7. Arduous

Meaning: Involving long, tiring, difficult effort.
Use it when: describing journeys, treks, and long tasks.
Avoid it when: talking casually — arduous is a formal word.

• They faced an arduous climb up the mountain.
• Cleaning the whole house was arduous.
• It was an arduous journey across the desert.

8. Strenuous

Meaning: Requiring intense physical or mental effort.
Use it when: describing exercise, workouts, and heavy work.
Avoid it when: describing emotional difficulty — strenuous is about effort.

• Avoid strenuous exercise after dinner.
• The training program was strenuous.
• Moving furniture is strenuous work.

9. Laborious

Meaning: Requiring slow, steady, tiring work.
Use it when: describing tedious, step-by-step processes.
Avoid it when: the task is quick but tricky — laborious is about grind, not cleverness.

• Writing the report was laborious.
• They did the laborious job of counting votes.
• Translating the book was laborious but rewarding.

10. Tricky

Meaning: Difficult in a clever, subtle, or unexpected way.
Use it when: describing puzzles, questions, and delicate situations.
Avoid it when: describing heavy labor — tricky is about cleverness, not weight.

• The last question was tricky.
• It is tricky to park on this street.
• He asked a tricky question.

11. Daunting

Meaning: So difficult that it feels intimidating.
Use it when: describing tasks that scare you a little.
Avoid it when: describing things that are merely boring — daunting means frightening.

• The huge project felt daunting at first.
• Speaking in public can be daunting.
• She faced the daunting task alone.

12. Formidable

Meaning: Impressively difficult; inspiring respect or awe.
Use it when: describing opponents, challenges, and obstacles.
Avoid it when: describing everyday hassles — formidable is grand.

• They faced a formidable challenge.
• He is a formidable chess player.
• The mountain is a formidable sight.

13. Grueling

Meaning: Extremely tiring and punishing.
Use it when: describing extreme physical or mental effort.
Avoid it when: describing mild difficulty — grueling is severe.

• The marathon was grueling.
• They survived a grueling training week.
• The exam season was grueling.

14. Thorny

Meaning: Full of awkward, prickly problems.
Use it when: describing issues, questions, and debates.
Avoid it when: describing physical tasks — thorny is for problems, not lifting.

• It is a thorny issue for the government.
• She raised a thorny question.
• The thorny topic divided the class.

15. Knotty

Meaning: Tangled and hard to solve, like a knot.
Use it when: describing problems, plots, and puzzles.
Avoid it when: talking casually — knotty is a less common word.

• It was a knotty problem to solve.
• The film has a knotty plot.
• They untangled the knotty legal issue.

16. Burdensome

Meaning: Heavy to carry, literally or figuratively.
Use it when: describing responsibilities, costs, and rules.
Avoid it when: describing fun challenges — burdensome is a weight, not a game.

• The taxes are burdensome for small shops.
• She found the rules burdensome.
• The debt became burdensome over time.

17. Taxing

Meaning: Draining your energy or patience.
Use it when: describing mental or physical strain over time.
Avoid it when: describing something easy but boring — taxing means draining.

• Caring for twins is taxing.
• The negotiations were mentally taxing.
• It was a taxing day at the office.

18. Troublesome

Meaning: Causing problems, worry, or difficulty.
Use it when: describing situations, people, or things that create hassle.
Avoid it when: you mean intellectually hard — troublesome is about hassle.

• The car has been troublesome lately.
• He had a troublesome cough all winter.
• It was a troublesome time for the family.

Difficult Synonyms: Formal vs. Casual Usage

Not every synonym fits every situation. Use this table to pick the right one — and explore more guides like synonyms for serious and synonyms for better.

Situation	Best Picks
Formal writing / professional	arduous, complex, formidable, laborious, demanding
Workplace	demanding, challenging, taxing, tough
Everyday conversation	hard, tough, tricky, challenging
Emotional / personal	grueling, burdensome, daunting, tough
Creative writing	thorny, knotty, formidable, daunting

Common Mistakes When Using Difficult Synonyms

1. Calling a miserable situation “challenging”. Challenging is positive — it promises growth. A funeral or a layoff is not “challenging”.
2. Mixing up “complicated” and “complex”. Complicated means tangled with too many parts; complex means deep and layered. A knot is complicated; the brain is complex. Grammarly’s guide to synonyms stresses matching each word’s exact shade to your context.
3. Using “exhausting” for mental difficulty. Exhausting describes the effect on you, not the task itself. The climb is grueling; you are exhausted.
4. Calling everything “hard”. Hard is fine, but it is vague — pick the precise shade: “thorny” for issues, “arduous” for journeys, “tricky” for puzzles.

FAQs About Difficult Synonyms

What is the most formal synonym for “difficult”?

Arduous and formidable are the most formal. At work, “demanding” and “complex” are safer and clearer.

What is the difference between “difficult” and “hard”?

“Hard” is casual and general — it also means “solid”. “Difficult” is slightly more formal and usually about effort or skill. In essays, prefer “difficult” or a precise synonym.

Which synonym means “difficult but rewarding”?

Challenging. It is the only one with a built-in positive tone — a challenging hike is worth it; a grueling one just hurts.

Can “difficult” describe people?

Yes — “a difficult person” means someone hard to deal with. For that sense, “troublesome” or “demanding” also work.

Where can I discuss these words with other learners?

The r/EnglishLearning community on Reddit is a great place to ask native speakers about subtle differences between synonyms.

Final Thoughts on Difficult Synonyms

“Difficult” is fine, but the precise word lands harder. Effort? Arduous. Complexity? Complex. A prickly problem? Thorny. Pick the exact shade, and your English gets sharper — even the difficult parts.

Keep building your vocabulary with SpellDict — explore all our synonym guides in the Synonyms category.