English Reference
noun · verb

endeavor

n. · v.
US /ɪnˈdɛvɝ/ en·deav·or UK spelling endeavors, endeavour

  1. 01 B2 Upper Intermediate Formal

    n.a serious and determined effort to achieve something.

    n.a sincere and industrious attempt to accomplish a specific goal or task.

    Simple

    The space program was a massive scientific endeavor that took years of planning.

    In context

    The restoration of the ancient cathedral was a collaborative endeavor involving historians, architects, and local craftsmen.

    inactivityidleness
  2. 02 C1 Advanced Formal

    v.to try very hard to do something.

    v.to exert oneself with purpose; to make a strenuous effort to achieve an objective.

    Simple

    We will endeavor to finish the project before the deadline.

    In context

    The diplomat promised to endeavor to resolve the conflict through peaceful negotiations despite the rising tensions.

    Usage

    Often followed by an infinitive ('to' + verb).

    Teacher's tip

    This verb is much more formal than 'try' or 'attempt'; it is best reserved for professional or academic writing.

He decided to create a network of agents, ensuring that one lost link wouldn’t doom the entire endeavor to failure.

Smithsonian Magazine· 17 Aug 2026

Reid Wiseman also said he'd had very honest conversations with his two daughters about the dangers involved with this endeavour.

BBC News· 11 Apr 2026
This entry
Level B2 · Upper Intermediate
Frequency Frequent
Updated