אֱוִיל ʼĕvîyl (H191)

(figuratively) silly

1) be foolish, foolish 1a) (subst) 1a1) of one who despises wisdom 1a2) of one who mocks when guilty 1a3) of one who is quarrelsome 1a4) of one who is licentious

from an unused root (meaning to be perverse);