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Adverb: insanely  in'seyn-lee
  1. In an insane manner
    "she behaved insanely"
    - crazily, dementedly, madly
     
  2. (used to intensify) extremely
    "insanely jealous"
    - madly, deadly, deucedly, devilishly

See also: insane

Antonym: sanely

Encyclopedia: Insanely