adjective. showing a lack of good sense; stupid or idiotic:You really couldn't invent a more pathetically incompetent, moronic, self-deluded jackass of a character than this.

What does a moronic person mean?

: a stupid or foolish person.

Is moronic formal?

Informal. a person who is notably stupid or lacking in good judgment: I wonder why they elected that narrow-minded moron to Congress.