What is the synonym of cold?

The definition of cold is:

cold noun 1. lack of heat (no plural) 2. an illness that makes you sneeze and cough

cold adj. 1. not hot or warm; low in temperature 2. unfriendly
1.

a. Having a low temeprature.

b.Having a temperature lower than normal body temperature.

c. feeling no warmth; uncomfortable chilled.