icily

adverb2

1. •
   In the manner of ice; with a cold or chilling effect.

   • The cold Alpine air flowed icily into his car, so he stopped by the roadside to put on a leather trench-coat, thick scarf, and woollen hat[…] — 1971
2. •
   (figurative) In an uncaring or coolly angry manner.

   • […]quite often her husband and Jo did not eat at home, or sat icily silent through a meal. — 1943