The term 'not taboo' can be defined by four crossword solutions: ACCEPTED (8 letters), ALLOWED (7 letters), LICIT (5 letters), and mentionable (11 letters). ACCEPTED means to be approved or agreed upon, while ALLOWED implies that something is given permission. LICIT means to be lawful or legitimate, and mentionable means to be able to be talked about. All of these words indicate that something is not considered taboo, or forbidden.