no-brainer
UK: /ˌnəʊˈbreɪ.nər/ | US: /ˌnoʊˈbreɪ.nɚ/
n. something that requires little or no mental effort to understand or decide
n. an extremely easy or obvious choice
The term "no-brainer" emerged in mid-20th century American slang, combining "no" (negation) + "brain" (symbolizing mental effort) + "-er" (agentive suffix). It humorously implies a decision so simple that it "doesn’t require a brain." The word reflects colloquial efficiency, transforming abstract concepts (effortlessness) into vivid imagery.
Choosing the cheaper option was a no-brainer.
The math problem was a no-brainer for the gifted student.
Investing in that startup seemed like a no-brainer at the time.
"Should we take the shortcut?" "Yeah, it’s a no-brainer."
The quiz had a few no-brainers to boost confidence.