Englishklutz
noun informal , mainly North American
1 if you spill a cup of coffee, you may laugh and joke about being a klutz:
oaf, ape, blunderer, bungler, hulk;
informal butterfingers, clodhopper;
British, informal clot;
North American, informal stumblebum, palooka;
Northern Irish, informal ganch;
informal , mainly North American lummox.
2 I left feeling a complete klutz:
fool, idiot, halfwit, nincompoop, blockhead, buffoon, dunce, dolt, ignoramus, cretin, imbecile, dullard, moron, simpleton, clod;
informal dope, ninny, chump, dimwit, nitwit, goon, dumbo, dummy, dum-dum, dumb-bell, loon, jackass, bonehead, fathead, numbskull, dunderhead, chucklehead, knucklehead, muttonhead, pudding-head, thickhead, wooden-head, airhead, pinhead, lamebrain, pea-brain, birdbrain, zombie, jerk, twerp, nerd, dipstick, donkey, noodle;
British, informal nit, numpty, twit, clot, ass, goat, plonker, berk, prat, pillock, wally, git, wazzock, divvy, nerk, charlie, mug, muppet;
Scottish, informal nyaff, balloon, sumph, gowk;
Irish, informal gobdaw;
North American, informal schmuck, bozo, boob, lamer, turkey, schlepper, chowderhead, dumbhead, dumbass, goofball, goof, goofus, galoot, dork, lummox, putz, schlemiel, sap, meatball, gink, cluck, clunk, ding-dong, dingbat, wiener, weeny, dip, simp, spud, coot, palooka, poop, squarehead, yo-yo, dingleberry;
US, informal wing nut;
Australian, New Zealand, informal drongo, dill, alec, galah, nong, bogan, poon, boofhead;
South African, informal mompara;
British, vulgar slang arse, arsehole, knobhead, twat, wanker;
North American, vulgar slang ass, asshole, asshat;
archaic tomfool, noddy, clodpole, loggerhead, spoony, mooncalf.
klutz Oxford Dictionary of English