The term 'not taut' can be described as something that is not tight or stretched. This term can be found in the crossword solutions of 'SLACK' (5 letters) and 'atease' (6 letters). SLACK is an adjective that means loose, not tight, or having a slackened tension. Atease is a verb that means to make someone feel relaxed or at ease. Both words are related to the term 'not taut' as they describe something that is not tight or stretched.