The term 'not too hot' can be described by four different words: WARM (4 letters), TEPID (5 letters), MILD (4 letters) and so-so (4 letters). WARM is a temperature that is slightly higher than comfortable, while TEPID is a temperature that is lukewarm. MILD is a temperature that is comfortable and not too hot or cold, and so-so is a temperature that is neither hot nor cold. All of these words describe temperatures that are not too hot.