The term 'No Idea!' is often used to express confusion or lack of knowledge about a certain topic. The crossword solutions for this term include DUNNO (5 letters), IVE (3 letters), IHAD (4 letters), IHAVE (5 letters), GOTME (5 letters), IDUNNO (6 letters), BEATSME (7 letters), IGIVEUP (7 letters), NOTACLUE (8 letters), DOESNTREGISTER (14 letters), and IHAVENTGOTACLUE (15 letters). All of these solutions are variations of the phrase 'No Idea!' and can be used to express confusion or lack of knowledge.