crucial
/ˈkruː.ʃəl/Extremely important in a way that affects the result of something. A crucial thing is not just important — it is the key factor that decides success or failure.
- Regular sleep is crucial for good health and concentration.
- The coach made a crucial decision in the final minutes.
- Strong vocabulary is crucial for scoring well in IELTS.
Adinary Nuance
Crucial sits in a group with critical, vital, essential, and important — but they are not freely interchangeable. Important is the weakest: it means something matters, but carries no urgency. Crucial implies a turning point — the outcome genuinely depends on this one factor. Critical overlaps closely but also carries a sense of crisis or danger (e.g., "critical condition"), making it feel more alarming. Vital suggests life-or-death necessity and sounds more emotional or dramatic. Essential means something is a required ingredient — you simply cannot do without it. In academic and IELTS writing, crucial is the best choice when you want to stress that one specific factor decides everything; use essential when you mean something is a baseline requirement.
In other languages
- Vietnamese
- Cực kỳ quan trọng
- Spanish
- Crucial
- Chinese
- 至关重要的
- Japanese
- 非常に重要な
- Korean
- 결정적인
Etymology
From Latin "crux" (cross, or decisive point), entering English via French in the early 18th century. The original sense referred to a cross-shaped test or a critical trial — a moment where two paths meet and a choice must be made.
Common phrases
Synonyms
Related words
Frequently asked questions
- Is 'crucial' stronger than 'important'?
- Yes. 'Important' simply means something matters a lot. 'Crucial' is stronger — it means the result depends specifically on this one thing. Use 'crucial' when you want to show that a factor is truly decisive.
- What is the difference between 'crucial' and 'critical'?
- Both mean extremely important, but 'critical' can also describe a dangerous or emergency situation (e.g., 'the patient is in a critical condition'). 'Crucial' stays focused on the idea of a turning point or decisive factor, without the medical or crisis connotation.
- Can I use 'crucial' in IELTS academic writing?
- Yes, 'crucial' is well-suited for IELTS essays and academic reports. It signals a high level of vocabulary and is appropriate in formal written English. Avoid repeating 'important' — swap in 'crucial', 'vital', or 'essential' to show range.
- How do I use 'crucial' correctly in a sentence?
- 'Crucial' is usually followed by 'to' + noun/gerund, or 'that' + clause. For example: 'Exercise is crucial to good health.' or 'It is crucial that you submit the form before the deadline.'