Etymology
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chilly (adj.)

1560s, "causing a sensation of cold," from chill (n.) + -y (2). Meaning "feeling coldish" is attested from 1610s; figurative sense of "distant, formal, not hearty or affectionate" is by 1841. Related: Chilliness. Earlier as an adjective was simply chill "tending to cause shivering" (1510s).

updated on November 09, 2017

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Definitions of chilly from WordNet
1
chilly (adj.)
not characterized by emotion; "a female form in marble--a chilly but ideal medium for depicting abstract virtues"-C.W.Cunningham;
chilly (adj.)
appreciably or disagreeably cold;
Synonyms: parky
chilly (adj.)
lacking warmth of feeling;
a chilly greeting
2
chilly (n.)
very hot and finely tapering pepper of special pungency;
Synonyms: chili / chili pepper / chilli / chile
From wordnet.princeton.edu, not affiliated with etymonline.