Silly, stupid, or dulled in mind (often from drugs or lack of sleep); sometimes spelled 'dopey'.
From 'dope' (Dutch origin, from 'doop' meaning sauce/liquid), which came to mean a drug or a stupid person. The '-y' suffix makes it an adjective.
In the early 1900s, 'dopy' meant someone in a daze, likely from early opiate use—then it broadened to mean any kind of stupidity, a linguistic shift that mirrors changing drug attitudes.
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