IPA: /ˈfrɔːstɪə/
KK: /ˈfrɔstɪər/
Having a very cold temperature, often associated with ice or frost; this form indicates a greater degree of coldness than the base form.
The weather today is frostier than it was yesterday, making it feel much colder outside.
Comparative: frostier
Superlative: frostiest
Frostier → It is formed from "frost" (from Old English *forst*, meaning frozen dew or ice) and "-ier" (a comparative suffix indicating more). The word "frostier" means having more frost or being more cold than something else.
Think of 'frost' as the icy condition and remember that 'frostier' means having more of that icy quality.