Frost″y (?), a. [Cf. AS. fyrstig.] 1. Attended with, or producing, frost; having power to congeal water; cold; freezing; as, a frosty night.
2. Covered with frost; as, the grass is frosty.
3. Chill in affection; without warmth of affection or courage. Johnson.
4. Appearing as if covered with hoarfrost; white; gray-haired; as, a frosty head. Shak.