wiseguy

/ˈwaɪzˌɡaɪ/
noun
  1. A person who is overly confident in their own opinions and often makes sarcastic or annoying comments.
    • The coach told the wiseguy on the team to stop talking back during practice.
    • My little brother thinks he's a wiseguy when he corrects my grammar.
    • Don't be such a wiseguy in class; the teacher doesn't appreciate your jokes.
  2. A member of a criminal organization, especially the Mafia.
    • The movie follows a young wiseguy who rises through the ranks of the mob.
    • Police arrested several wiseguys involved in the illegal gambling ring.
    • He grew up in a neighborhood where many wiseguys ran the local businesses.
Antonyms
What does "wiseguy" mean? | whatsthatwordmean | whatsthatwordmean