Endeavor
/ɪˈndɛvər/
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Definition
(noun) A sincere attempt; a determined or assiduous effort towards a specific goal; assiduous or persistent activity.
Sentence Examples
Dieting takes up so much human endeavor with so little to show for it.
I'm sure your endeavor will bear fruit.
CEFR Practice Quiz
Starting a new business is a very difficult but rewarding ____.