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HYPHEN
WORDNET DICTIONARY
OXFORD DICTIONARY
THESAURUS

WORDNET DICTIONARY

Adjective dotty has 2 senses

• dotty(s = adj.all) around the bend, balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky - informal or slang terms for mentally irregular; "it used to drive my husband balmy"
• dotty(s = adj.all) crazy, gaga, wild - intensely enthusiastic about or preoccupied with; "crazy about cars and racing"; "he is potty about her"

OXFORD DICTIONARY

THESAURUS

dotty

abnormal, absurd, anomalous, balmy, bananas, barmy, bats, batty, beany, besotted, bespangled, blotched, blotchy, bonkers, buggy, bughouse, bugs, crackers, crank, crankish, cranky, crazy, crotchety, cuckoo, daffy, deviant, deviative, different, dippy, divergent, dotted, eccentric, enamored, erratic, exceptional, fantastic, fey, flaky, flea-bitten, flecked, fleckered, flipped, freaked-out, freakish, frecked, freckled, freckly, fruitcakey, fruity, funny, gaga, goofy, haywire, idiocratic, idiosyncratic, infatuate, insane, irregular, just plain nuts, kinky, kooky, loony, loopy, macular, maculate, maculated, maggoty, nuts, nutty, odd, oddball, off the hinges, off the track, off the wall, patchy, peculiar, peppered, pocked, pockmarked, pocky, pointille, pointillistic, polka-dot, potty, preposterous, punctated, queer, quirky, round the bend, screwball, screwballs, screwy, singular, slaphappy, spangled, specked, speckled, speckledy, speckly, splotched, splotchy, spotted, spotty, sprinkled, stippled, strange, studded, twisted, unconventional, unnatural, wacky, whimsical

For further exploring for "dotty" in Webster Dictionary Online