1. The quality or state of being very cold; the presence of frost or freezing temperatures.
2. Coldness or unfriendliness in manner, tone, or attitude; lack of warmth in social interaction.

Examples

• The frostiness of the morning air made it difficult to breathe.
• There was a noticeable frostiness between the two former friends.
• The frostiness in her voice suggested she was upset with him.
• Winter brought frostiness to the garden, coating the plants with ice.
• His frostiness toward new colleagues made them uncomfortable.
• The frostiness of the reception caught the speaker off guard.