Idiotic
Part of speech: adjective
Definition: Pertaining to or resembling an idiot; afflicted with idiocy. Having the quality of idiocy; very foolish; stupid; nonsensical.
Example sentence: We notice in others only those things that relate to ourselves. For example, you could find someone hilarious and brilliant, and I could find the same person idiotic and annoying. It's the same person doing the same thing, but because we are viewing them from our own unique perspectives, they mirror back to us something different.
Imbecile
Part of speech: noun
Definition: A person with limited mental capacity who can perform tasks and think only like a young child, in medical circles meaning a person who lacks the capacity to develop beyond the mental age of a normal five to seven-year-old child (not commonly used today)A fool, an idiot.
Example sentence: I think Wallace Hall is an imbecile.