The term 'not so sure' can be expressed in a variety of ways. The five crossword solutions for this term are LEERY (5 letters), IFFIER (6 letters), AMBIVALENT (10 letters), INDECISIVE (10 letters), and IFFY (4 letters). LEERY is an adjective meaning to be cautious or suspicious. IFFIER is an adjective meaning more uncertain or unreliable than before. AMBIVALENT is an adjective meaning having mixed feelings or contradictory ideas about something. INDECISIVE is an adjective meaning unable to make decisions. Lastly, IFFY is an adjective meaning uncertain or unreliable. All of these words describe the feeling of being unsure or not so sure.