Crosswordiee.com

% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Extreme foolishness 8 letters:

INSANITY: Extreme foolishness
LOONY: Extremely foolish
LUNACY: Extreme foolishness
INSANE: Extremely foolish
IDIOCY: Extreme foolishness
ASININE: Extremely foolish