stupid

UK: ˈstjuːpɪd | US: ˈstuːpɪd

Definition
  1. adj. lacking intelligence or common sense

  2. adj. (informal) used to express annoyance or disdain

  3. n. (archaic) a stupid person

Structure
stup <dull, numb>id <adjective suffix>stup <dull, numb>id <adjective suffix>
Etymology

The word "stupid" traces back to Latin stupere, meaning "to be stunned or numb," which evolved into stupidus ("dull, foolish"). It entered English via French stupide in the 16th century, originally describing physical numbness but shifting to denote mental slowness or lack of wit. The suffix -id solidifies its adjectival form, emphasizing the trait of dullness.

Examples
  1. His stupid mistake cost the team the game.

  2. Don’t be stupid—wear a helmet when biking.

  3. She felt stupid for forgetting her keys again.

  4. The movie’s plot was so stupid that I left early.

  5. (Archaic) "The village fool was often called a stupid."