Silly, foolish, or not very intelligent; or in a dazed, drowsy state as if drugged.
From 'dope' (from Dutch 'doop,' a sauce), which came to mean a stupefying drug in the late 1800s. The adjective 'dopey' means either acting like you're under the influence or just being silly.
The word 'dope' started as a sauce in Dutch, became slang for stupefying drugs when opium was popular, and then became a general word for anything foolish—it's a journey from condiment to narcotics to insult! The Disney character Dopey the dwarf popularized the modern meaning.
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