Endeavor vs Undertake

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

Endeavor

FormalTop 3,000 (common)B1

Undertake

Top 2,000 (common)B2verb
Most formal: EndeavorMost common: Undertake
 EndeavorUndertake
Pronunciation🇬🇧 //ɪnˈdɛv.ər//🇺🇸 //ɪnˈdɛv.ɚ//🇬🇧 /["/ˌʌndəˈteɪk/","/ˌʌndəˈteɪks/","/ˌʌndəˈtʊk/","/ˌʌndəˈteɪkən/","/ˌʌndəˈteɪkɪŋ/"]/🇺🇸 /["/ˌʌndərˈteɪk/","/ˌʌndərˈteɪks/","/ˌʌndərˈtʊk/","/ˌʌndərˈteɪkən/","/ˌʌndərˈteɪkɪŋ/"]/
MeaningTo try hard to do something.To take on a task or responsibility.
ExampleWe will endeavor to meet the project deadline.to **undertake a task/project**
RegisterFormalNeutral
How commonTop 3,000 (common)Top 2,000 (common)
CEFR levelB1B2
Part of speechverb
Collocationsmake an endeavor, a noble endeavor, personal endeavorundertake a project, undertake research, undertake responsibilities, undertake an assignment, undertake a task
Antonymsabandon, give up, stopabandon, neglect, shirk
Common mistakesConfused with 'endeavor' vs 'endeavoured'; not all varieties use the British spelling., Using 'endeavor' without stating what is being endeavored., Incorrectly using 'endeavor' in everyday casual speech.Confusing with 'take on' — they are similar but context differs., Using 'undertake' without an object — remember to specify what is being undertaken., Incorrect verb forms like 'undertaked' instead of 'undertook' or 'undertaken'.
Usage notesUse in formal contexts, such as academic settings or professional writing. Avoid in casual conversations.Use 'undertake' for formal or serious tasks. Avoid using it in casual conversations. It’s more common in academic or professional contexts.

Frequently asked questions: Endeavor vs Undertake

What's the difference between Endeavor and Undertake?

Endeavor: To try hard to do something. Undertake: To take on a task or responsibility.

Which is more formal: Endeavor and Undertake?

Endeavor is the most formal of these.

Which is more common: Endeavor and Undertake?

Undertake is the most common in everyday English.

Which is more advanced: Endeavor and Undertake?

Undertake is the highest level, at B2, on the CEFR scale.

Are Endeavor and Undertake the same CEFR level?

Endeavor: B1, Undertake: B2 on the CEFR scale.

Can you show an example of each?

Endeavor: We will endeavor to meet the project deadline. Undertake: to **undertake a task/project**

Can I use Endeavor and Undertake interchangeably?

Not always. Endeavor and Undertake 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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