The term 'less sure' can be described by two crossword solutions: 'chancier' (8 letters) and 'iffier' (6 letters). Both terms refer to something that is uncertain, unreliable, or risky. Chancier is an adjective meaning 'full of risk or uncertainty, ' while iffier is an informal adjective meaning 'uncertain or unreliable.' Both terms are used to describe a situation that is not certain or reliable.