Also means
icy, cold (atmosphere or manner)
Usage Note
frostig describes air or surfaces at or near freezing — ein frostiger Morgen. Figuratively it describes a cold, unwelcoming manner: ein frostiger Empfang (a frosty reception). The transition between literal and figurative uses is fluid in everyday German.
Examples
"Der frostige Ton der Antwort ließ sie erschaudern."
Natural Translation
The frosty tone of the reply made her shudder.
Literal Translation
The frosty tone of the answer let her shudder.

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