Word parts frost + -y Pronunciation IPA (key): /ˈfrɒsti/ Audio (AU)(file) Adjective Positive frosty Comparative frostier Superlative frostiest When something is frosty, it is very cold. Synonyms: chilly, cold, cool, freezing and wintry Antonyms: hot, summery and warm When someone is frosty, they are not friendly. Synonyms: hostile, unfriendly and withdrawn Antonyms: cheerful, friendly, kind, sympathetic, warm and welcoming Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads