featherbrained

/ˈfɛðərˌbreɪnd/
adjective
  1. Silly, forgetful, or not very intelligent; acting without thought.
    • My featherbrained cousin forgot her own birthday party.
    • The movie's plot was so featherbrained that no one could follow it.
    • He made a featherbrained decision to quit his job without having another one lined up.
Antonyms
What does "featherbrained" mean? | whatsthatwordmean | whatsthatwordmean