Frosty (adjective)

1. Covered with frost or ice crystals.
2. Feeling cold or chilly.
3. Unfriendly or cold in manner or behavior.

Origin:

From the word "frost" meaning a covering of ice crystals on a surface.

Examples:

1. The grass was frosty in the morning.
2. It was a frosty night and the temperature dropped to freezing.
3. She had a frosty reception from her coworkers.
4. He had a frosty attitude towards his boss.
5. The relationship between the two countries was frosty.