Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Mentally unbalanced; crazy.
  • adjective Amusingly eccentric or unconventional.
  • adjective Ridiculous or absurd.
  • adjective Having a feeble or unsteady gait; shaky.
  • adjective Obsessively infatuated or enamored.

from The Century Dictionary.

  • Having dots; covered or characterized by dots: as, a low, dotty underwood.
  • Of unsteady gait; feeble and tottering, as from stiffness or lameness: as, to be a little dotty on one's feet.
  • Feeble-minded; silly.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Composed of, or characterized by, dots.
  • adjective engraving Unsteady in gait; hence, feeble; half-witted.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective Having many dots.
  • adjective UK Mildly insane or excessively preoccupied; often, senile.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective informal or slang terms for mentally irregular
  • adjective intensely enthusiastic about or preoccupied with

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Probably alteration of Scots dottle, silly, from Middle English doten, to dote.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

dot +‎ -y

Examples

Comments

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  • -- Who is he if it's a fair question, Mrs Breen asked. Is he dotty?

    Joyce, Ulysses, 8

    January 3, 2007