Where does “batty” come from?

batty (English) comes from English bat, from French bât, from Old French bast, from Vulgar Latin bastum, from Latin bastāre, from Ancient Greek βαστάζω — to lift, lift up, raise; to bear, carry; to carry...

batty (English): Mad, crazy, silly; Belonging to, or resembling, a...

Definitions

Mad, crazy, silly; Belonging to, or resembling, a...

Ancestry of “batty”, step by step

Step	Language	Word	Meaning
1	English	bat	Any of the flying mammals of the order...
2	French	bât	packsaddle
3	Old French	bast	packsaddle
4	Vulgar Latin	bastum	A stick
5	Latin	bastāre	—
6	Ancient Greek	βαστάζω	to lift, lift up, raise; to bear, carry; to carry...

Words derived from “batty”

batshit
battiness
batty boy
battily
bati
batshitness
batshittery

Every word from Ancient Greek βαστάζω →Every word from Latin bastāre →Every word from Vulgar Latin bastum →