Conviction vs Opinion

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

Conviction

Top 3,000 (common)C1noun

Opinion

Top 1,000 (very common)A1noun
Most common: Opinion
 ConvictionOpinion
Pronunciation🇬🇧 /["/kənˈvɪkʃn/"]/🇺🇸 /["/kənˈvɪkʃn/"]/🇬🇧 /["/əˈpɪnjən/"]/🇺🇸 /["/əˈpɪnjən/"]/
MeaningA strong belief or opinion.What you think about something.
ExampleHer conviction for theft led to a five-year prison sentence.In my opinion, the movie was fantastic.
RegisterNeutralNeutral
How commonTop 3,000 (common)Top 1,000 (very common)
CEFR levelC1A1
Part of speechnounnoun
Collocationsearlier, previous, prior, have, lead to, obtain, be based on, rate, on conviction, conviction against, conviction for, the rate of conviction, absolute, complete, total, have, hold, share, politics, with conviction, without conviction, conviction about, have the courage of your convictions, absolute, complete, total, have, hold, share, politics, with conviction, without conviction, conviction about, have the courage of your convictionsgood, high, low, have, hold, air, change, differ, vary, piece, in your opinion, opinion about, opinion on, be of the opinion that…, a difference of opinion, in my humble opinion, prevailing, general, popular, body, mould/​mold, shape, sway, be against something, be in favour/​favor of something, be divided, poll, former, leader, opinion among, climate of opinion, shades of opinion
Antonymsdoubt, uncertainty, indecisionfact, certainty, truth
Common mistakesConfused with 'confidence'; they have different meanings., Using 'conviction' as a verb; it's only a noun., Mispronouncing it or stressing the wrong syllable.'Opinion' is often confused with 'view' or 'idea', but it’s more about personal belief., Saying 'in my opinion' too frequently can make writing sound repetitive., 'Opinion' is countable, so use 'an opinion' not 'a opinion'.
Usage notesUsed in discussions about beliefs, legal contexts, or strong opinions. Avoid in casual conversations unless discussing beliefs seriously.Use 'opinion' when discussing thoughts or views. It’s neutral and suits most situations but may be too informal for formal essays.

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Conviction
Opinion

Frequently asked questions: Conviction vs Opinion

What's the difference between Conviction and Opinion?

Conviction: A strong belief or opinion. Opinion: What you think about something.

Which is more common: Conviction and Opinion?

Opinion is the most common in everyday English.

Which is more advanced: Conviction and Opinion?

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

Are Conviction and Opinion the same CEFR level?

Conviction: C1, Opinion: A1 on the CEFR scale.

What part of speech are Conviction and Opinion?

Conviction: noun, Opinion: noun.

Can you show an example of each?

Conviction: Her conviction for theft led to a five-year prison sentence. Opinion: In my opinion, the movie was fantastic.

Can I use Conviction and Opinion interchangeably?

Not always. Conviction and Opinion 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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