Wacky
/ˈwæki/noun
Silly, eccentric, or absurd in a playful way.
Did you know?The modern slang sense of wacky is tied to older dialect words like wack and wacky meaning weak, feeble, or off-kilter, showing how “weird” often began as a physical sense of being out of shape.
Etymological Timeline
Old English
OE
wac
“weak, feeble, soft”
Middle English
ME
wacke
“weak, feeble, lacking firmness”
18th-19th Century
English
wacky
“feeble, shaky, unstable; then odd or eccentric in dialect use”
20th Century
English
wacky
“slapstick, absurd, comically eccentric”