Temperature:
* Cold: This is the most straightforward opposite, referring to a low temperature.
* Freezing: Indicates a temperature at or below the freezing point of water.
* Chilly: This suggests a slightly cold temperature.
Feeling:
* Cold: This can also be used to describe a lack of warmth in a person's demeanor or attitude.
* Aloof: This implies distance and a lack of friendliness.
* Unwelcoming: This suggests a lack of hospitality or kindness.
Color:
* Cool: This refers to a color on the opposite end of the color spectrum from warm colors like red, orange, and yellow.
Other:
* Unfriendly: This describes a lack of warmth in a person's personality.
* Unpleasant: This refers to something that is not comfortable or enjoyable.
To find the most appropriate opposite, consider the specific meaning of "warm" in the context you are using it.