gaumless

/ˈɡɔmləs/
adjective
  1. Lacking sense, intelligence, or common sense; foolish or stupid.
    • He made a gaumless remark that embarrassed everyone at the dinner table.
    • The gaumless driver ignored the warning signs and drove straight into the floodwater.
    • It was gaumless of her to leave the keys in the car with the engine running.