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wacky
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Dictionary definition
· wacky
adjective
ludicrous, foolish
"wore a goofy hat"
informal or slang terms for mentally irregular
"it used to drive my husband balmy"
Similar words
goofy
silly
whacky
zany
around the bend
balmy
barmy
bats
batty
bonkers
Source: Open English WordNet (CC BY 4.0).