Imbecile
Definition 1 of 3

Informal Use
Used casually among friends, but it can be very hurtful and offensive if used improperly.

Dude, you're such an imbecile for losing your keys again!
Negative Connotation
Conveys a strong negative feeling about someone's behavior or intelligence.

Only an imbecile would trust a complete stranger with all their money.
Avoid in Formality
Inappropriate in formal or polite contexts such as work, school, or when speaking with strangers.

I refrained from calling him an imbecile and chose a more diplomatic term.
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doltdullardfoolidiotmoronsimpleton
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