n. 25B6; noun
you've acted like a complete fool : IDIOT, ass, halfwit, blockhead, dunce, dolt, dullard, simpleton, clod; informal dope, ninny, nincompoop, chump, dimwit, coot, goon, dumbo, dummy, dum-dum, fathead, numbskull, dunderhead, pudding-head, thickhead, airhead, lamebrain, cretin, moron, nerd, imbecile, pea-brain, birdbrain, jerk, dipstick, donkey, noodle; Brit. informal nit, nitwit, twit, clot, goat, plonker, berk, prat, pillock, wally, git, dork, twerp, charlie, mug; Scottish informal nyaff, balloon, sumph, gowk; N. Amer. informal schmuck, bozo, boob, turkey, schlepper, chowderhead, dumbhead, goofball, goof, goofus, galoot, lummox, klutz, putz, schlemiel, sap, meatball; Austral./NZ informal drongo, dill, alec, galah, boofhead.
she made a fool of me : LAUGHING STOCK, dupe, butt, gull; informal stooge, sucker, mug, fall guy; N. Amer. informal sap.
(historical) the fool in King James's court : JESTER, court jester, clown, buffoon, joker, zany, merry andrew; wearer of the motley.
25B6; verb
he'd been fooled by a schoolboy : DECEIVE, trick, hoax, dupe, take in, mislead, delude, hoodwink, bluff, gull; swindle, defraud, cheat, double-cross; informal con, bamboozle, pull a fast one on, take for a ride, pull the wool over someone's eyes, put one over on, have on, diddle, fiddle, rip off, do, sting, shaft; Brit. informal sell a pup to; N. Amer. informal sucker, snooker, stiff, euchre, hornswoggle; Austral. informal pull a swifty on; poetic/literary cozen.
I'm not fooling, I promise : PRETEND, make believe, feign, put on an act, act, sham, fake; joke, jest; informal kid; Brit. informal have someone on.
25A0; fool around
someone's been fooling around with the controls : FIDDLE, play (about/around), toy, trifle, meddle, tamper, interfere, monkey about/around; informal mess about/around; Brit. informal muck about/around.
(N. Amer. informal) my husband's been fooling around : PHILANDER, womanize, flirt, have an affair, commit adultery; informal play around, mess about/around, carry on, play the field, sleep around; Brit. informal play away.