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.
got a frosty reception
a frosty glass
crisp clear nights and frosty mornings
frost
frost-bite
frostbitten
frosted
frosting
frosty
froth
frothy
frottage
frou-frou
frounce
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