The definition of a no brainer is a situation in which there is one clear obvious or right answer and in which no real thought is required to decide what to do.noun
An example of a no brainer is if someone asks if you want a million dollars free and clear with absolutely no taxes or strings attached.YourDictionary definition and usage example. Copyright © 2013 by LoveToKnow Corp.
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no-brainer - Cultural Definition
Something that is absurdly simple or easy and requires little thought: “Making pumpkin pie can be a no-brainer if you use frozen pastry and canned filling.”