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

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

2. (adjective) not functioning properly

• amiss
• awry
• wrong

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

• insane

2. (adjective) not functioning properly

• malfunctioning
• nonfunctional

1. (noun) wire for tying up bales of hay

• wire

1. (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