insane

/ɪnˈseɪn/
adjective
  1. Extremely foolish or unreasonable; not showing good judgment.
    • She had the insane idea of quitting her job without any savings.
    • It would be insane to drive in this blizzard without snow tires.
    • The plan was so risky that everyone called it insane.
  2. In a state of severe mental illness, unable to think or behave normally.
    • The court declared him insane and unfit for trial.
    • The novel tells the story of a man slowly going insane.
    • After years of isolation, he became completely insane.
  3. Very impressive, exciting, or extreme (informal, often positive).
    • The special effects in that movie are absolutely insane.
    • He scored an insane goal from midfield.
    • That concert was insane — the crowd went wild!
Antonyms