Imbecile
Definition 1 of 3
Pro Tip 1/3
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!
Pro Tip 2/3
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.
Pro Tip 3/3
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.