Etymology
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frosty (adj.)

Old English forstig, fyrstig "as cold as frost;" see frost (n.) + -y (2). Figurative use from late 14c. Related: Frostily; frostiness. Similar formation in Dutch vorstig, German frostig.

updated on January 13, 2015

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Definitions of frosty from WordNet

frosty (adj.)
devoid of warmth and cordiality; expressive of unfriendliness or disdain;
got a frosty reception
Synonyms: frigid / frozen / glacial / icy / wintry
frosty (adj.)
covered with frost; "hedgerows were rimed and stiff with frost"-Wm.Faulkner;
a frosty glass
Synonyms: rimed / rimy
frosty (adj.)
pleasantly cold and invigorating;
crisp clear nights and frosty mornings
Synonyms: crisp / nipping / nippy / snappy
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.