The term 'not sweet' can be described by the following crossword solutions: SEC (3 letters), DRY (3 letters), BITTER (6 letters), DEMONIC (7 letters), PUNGENT (7 letters), MALODOROUS (10 letters), ACRIMONIOUS (11 letters), and CACOPHONOUS (11 letters). These words all describe something that is not sweet, but rather has a negative connotation. SEC and DRY refer to a lack of sweetness, while BITTER, DEMONIC, PUNGENT, MALODOROUS, ACRIMONIOUS, and CACOPHONOUS all refer to unpleasant tastes, smells, or sounds that are not sweet.