Nobody's fool is an idiom used to describe someone who is wise and not easily tricked or taken advantage of. The crossword solutions for this term are ASTUTE (6 letters), SAGACIOUS (9 letters), CAGY (4 letters), SMART (5 letters), SHARP (5 letters), and smartcookie (11 letters). ASTUTE means having or showing an ability to accurately assess situations or people and turn that understanding into a successful action. SAGACIOUS means having or showing keen mental discernment and good judgement. CAGY means shrewd and cautious, especially in money matters. SMART means having or showing intelligence or quick-wittedness. SHARP means having or showing a quick and inventive mind. Smartcookie means someone who is clever and resourceful.