1. (adjective) ludicrous, foolish

• cockamamie
• cockamamy
• goofy
• sappy
• silly
• whacky
• zany

2. (adjective) informal or slang terms for mentally irregular

• around the bend
• balmy
• barmy
• bats
• batty
• bonkers
• buggy
• cracked
• crackers
• daft
• dotty
• fruity
• haywire
• kookie
• kooky
• loco
• loony
• loopy
• nuts
• nutty
• round the bend
• whacky

1. (adjective) ludicrous, foolish

• foolish

2. (adjective) informal or slang terms for mentally irregular

• insane

1. (adjective) ludicrous, foolish

• absurdity
• fatuity
• fatuousness
• silliness
• bozo
• bozo
• cuckoo
• cuckoo
• fathead
• fathead
• goof
• goof
• goofball
• goofball
• goose
• goose
• jackass
• jackass
• twat
• twat
• zany
• zany
• buffoon
• clown
• goof
• goofball
• merry andrew
• zany

2. (adjective) informal or slang terms for mentally irregular

• addle-head
• addlehead
• birdbrain
• loon
• craziness
• daftness
• flakiness
• kook
• odd fellow
• odd fish
• odd man out
• queer bird
• queer duck