Important vs Integral

When to use each in English, with meaning, register, and examples.

Important

Top 1,000 (very common)A1adjective

Integral

FormalTop 3,000 (common)C1adjective
Most formal: IntegralMost common: Important
 ImportantIntegral
Pronunciation🇬🇧 /["/ɪmˈpɔːtnt/"]/🇺🇸 /["/ɪmˈpɔːrtnt/"]/🇬🇧 /["/ˈɪntɪɡrəl//ɪnˈteɡrəl/"]/🇺🇸 /["/ˈɪntɪɡrəl//ɪnˈteɡrəl/"]/
MeaningSomething that matters a lot.Important and necessary for something.
ExampleIt's important to drink enough water every day.Music is **an integral part of** the school's curriculum.
RegisterNeutralFormal
How commonTop 1,000 (very common)Top 3,000 (common)
CEFR levelA1C1
Part of speechadjectiveadjective
Collocationsbe, seem, sound, extremely, fairly, very, for, to, be, seem, sound, extremely, fairly, very, for, tointegral part, integral role, integral component, integral to success, integral aspect
Antonymsunimportant, trivial, insignificantinsignificant, unnecessary
Common mistakesConfusing with 'unimportant'—'not important' is the opposite., Using with nouns incorrectly—'important' only describes nouns, not verbs., Overusing—try varying language with synonyms to improve vocabulary.Confusing with 'integrate' which has a different meaning., Using in informal settings where simpler words would suffice., Incorrectly using as a noun instead of an adjective.
Usage notesUse 'important' for things that have significance or impact. It's appropriate in formal and informal contexts, but in very casual conversation, words like 'big deal' might be more appropriate.Use 'integral' in formal contexts, such as academic writing or professional discussions. It's usually not appropriate for casual conversations.

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Important

Frequently asked questions: Important vs Integral

What's the difference between Important and Integral?

Important: Something that matters a lot. Integral: Important and necessary for something.

Which is more formal: Important and Integral?

Integral is the most formal of these.

Which is more common: Important and Integral?

Important is the most common in everyday English.

Which is more advanced: Important and Integral?

Integral is the highest level, at C1, on the CEFR scale.

Are Important and Integral the same CEFR level?

Important: A1, Integral: C1 on the CEFR scale.

What part of speech are Important and Integral?

Important: adjective, Integral: adjective.

Can you show an example of each?

Important: It's important to drink enough water every day. Integral: Music is **an integral part of** the school's curriculum.

Can I use Important and Integral interchangeably?

Not always. Important and Integral are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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