The term 'not so hot' can be described in a variety of ways, including TEPID (5 letters), MEH (3 letters), BLAH (4 letters), MILD (4 letters), WARM (4 letters), POOR (4 letters), COOL (4 letters), so-so (4 letters), COLDER (6 letters), and below par (8 letters). TEPID means lukewarm or slightly WARM, while MEH is an expression of indifference or apathy. BLAH is an expression of boredom or lack of enthusiasm. MILD is a synonym for gentle or moderate. WARM is a synonym for comfortable or cozy. POOR is a synonym for inadequate or unsatisfactory. COOL is a synonym for refreshing or invigorating. So-so is an expression of mediocrity or average quality. COLDER is a synonym for chillier or less WARM. Below par is an expression of inferiority or substandard quality.