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Something, especially a choice or decision, that is so obvious or easy as to require little or no thought.
slang something which requires little or no mental effort
Informal. anything requiring little thought or effort; something easy or simple to understand or do.
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|Noun||1.||no-brainer - anything that requires little thought|
project, task, undertaking, labor - any piece of work that is undertaken or attempted; "he prepared for great undertakings"
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech