no-brainer
noun/ˌnəʊ ˈbreɪnə(r)/
/ˌnəʊ ˈbreɪnər/
(informal)- a decision or a problem that you do not need to think about much because it is obvious what you should do
- The question of who to support in this election should be a no-brainer.
- I said yes straight away. It was a no-brainer for me.
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no-brainer