Commitment vs Pledge vs Promise

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

Commitment

Top 2,000 (common)B2noun

Pledge

FormalTop 2,000 (common)C1verb

Promise

Top 1,000 (very common)A2verb
Most formal: PledgeMost common: Promise
 CommitmentPledgePromise
Pronunciation🇬🇧 /["/kəˈmɪtmənt/"]/🇺🇸 /["/kəˈmɪtmənt/"]/🇬🇧 //plɛdʒ//🇺🇸 //plɛdʒ//🇬🇧 /["/ˈprɒmɪs/","/ˈprɒmɪsɪz/","/ˈprɒmɪst/","/ˈprɒmɪsɪŋ/"]/🇺🇸 /["/ˈprɑːmɪs/","/ˈprɑːmɪsɪz/","/ˈprɑːmɪst/","/ˈprɑːmɪsɪŋ/"]/
MeaningA promise to do something or stay loyal.To make a serious promise or commitment.A commitment to do something or not do something.
ExampleHis commitment to the project ensured its success.She decided to pledge her support to the charity event.I promise to help you with your homework.
RegisterNeutralFormalNeutral
How commonTop 2,000 (common)Top 2,000 (common)Top 1,000 (very common)
CEFR levelB2C1A2
Part of speechnounverbverb
Collocationsabsolute, complete, full, degree, level, give, make, demonstrate, commitment on, commitment to, a lack of commitment, absolute, complete, full, degree, level, give, make, demonstrate, commitment on, commitment to, a lack of commitment, big, considerable, major, have, take on, fulfil/​fulfill, commitment on, heavy, time, commitment ofpledge allegiance, pledge support, pledge a donationfaithfully, solemnly, initially, can, cannot, seem to, to, as promised, I can’t promise anything
Antonymsdisloyalty, indifferencerenounce, disavow, withdrawlie, break, betray
Common mistakesUsing 'commitment' without specifying what it's to., Confusing 'commitment' with 'commit' as a verb., 'Commitment' often misused in informal contexts.Confused with 'pledged' vs 'pledge' as different tenses., Omitting the object after the verb., Using 'pledge' when referring to a general promise instead of a formal commitment.Confusing 'promise' with 'vow' or 'pledge' in terms of strength., Using 'promise' without an object (e.g., 'I promise' should specify what)., Misusing in the past tense (e.g., 'I promised' without a follow-up).
Usage notesUsed when discussing promises or obligations in personal or professional contexts. It's generally appropriate in serious discussions and may not fit casual chatting.Typically used in formal contexts, such as during ceremonies or official statements. Avoid in casual conversations.Use 'promise' when you want to express a vow or assurance. Common in both spoken and written contexts, but avoid in formal legal documents.

Frequently asked questions: Commitment vs Pledge vs Promise

What's the difference between Commitment, Pledge, and Promise?

Commitment: A promise to do something or stay loyal. Pledge: To make a serious promise or commitment. Promise: A commitment to do something or not do something.

Which is more formal: Commitment, Pledge, and Promise?

Pledge is the most formal of these.

Which is more common: Commitment, Pledge, and Promise?

Promise is the most common in everyday English.

Which is more advanced: Commitment, Pledge, and Promise?

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

Are Commitment, Pledge, and Promise the same CEFR level?

Commitment: B2, Pledge: C1, Promise: A2 on the CEFR scale.

What part of speech are Commitment, Pledge, and Promise?

Commitment: noun, Pledge: verb, Promise: verb.

Can you show an example of each?

Commitment: His commitment to the project ensured its success. Pledge: She decided to pledge her support to the charity event. Promise: I promise to help you with your homework.

Can I use Commitment, Pledge, and Promise interchangeably?

Not always. Commitment, Pledge, and Promise 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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