From Middle English frosty, forsty, from Old English forstiġ, fyrstiġ (“frosty”), from Proto-West Germanic *frostag, *frustīg, equivalent to frost + -y. Cognate with West Frisian froastich (“frosty”), Dutch vorstig (“frosty”), German Low German fröstig (“frosty”), German frostig (“frosty”), Swedish frostig (“frosty”). Compare also Saterland Frisian froasterch (“frosty”), German Low German frösterg (“frosty”).
- Cold, chilly.
- The air was frosty; I could see my breath and walked quickly with my hands in my pockets.
- I'd like a frosty milkshake.
- Having frost on it.
- The frosty pumpkin is the sign of the end of the growing season, soon the greenery will wither and harvest end for the year.
- (figurative) Having an aloof or inhospitable manner.
- After the divorce, she was civil but frosty to her ex.