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dotty (adj.)

1812, "full of dots," from dot (n.) + -y (2). Meaning "silly" is from c. 1400, in dotypolle "dotty poll" (i.e. "dotty head"), in which case the first element is from dote (v.).

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Definitions of dotty from WordNet

dotty (adj.)
informal or slang terms for mentally irregular;
Synonyms: balmy / barmy / bats / batty / bonkers / buggy / cracked / crackers / daft / fruity / haywire / kooky / kookie / loco / loony / loopy / nuts / nutty / round the bend / around the bend / wacky / whacky
dotty (adj.)
intensely enthusiastic about or preoccupied with;
they are dotty about each other
Synonyms: crazy / wild / gaga
From wordnet.princeton.edu