Synonyms for Foolish

Synonyms starting with letter O

• obtuse

  wacky
• outrageous
• outlandish
• overhasty
• oafish
• odd
• out to lunch
• off-the-wall
• out of the question
• overoptimistic
• open
• off-color
• ornate
• ostentatious
• overpriced
• of unsound mind
• off the wall
• opinionated
• out of sight
• of no account
• off the deep end
• out of all reason
• oblivious
• out
• out of it
• off the top of head
• off top of head
• off deep end
• oddball
• off your head

  silly
• obscure
• obsessed
• opaque
• overbold

  irresponsible
• oversimplified
• off guard
• off the air
• out there
• off your trolley
• off the rails