noun
a person who lacks intelligence or common sense
adjective
having or showing a great lack of intelligence or common sense; silly or foolish
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It is not appropriate to use the word 'stupid' in a professional setting.
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I can't believe you made such a stupid mistake.
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That movie was so stupid, I can't believe I wasted my time watching it.
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His decision to quit his job without another one lined up was just plain stupid.