The term 'No Fooling!' is an expression used to emphasize that something is true and not a joke. The crossword solutions for this term are 'TRULY' (5 letters), 'Duh' (3 letters), 'HONEST' (6 letters), 'REALLY' (6 letters), 'Iswear' (6 letters), 'Forreal' (7 letters), and 'Imeanit' (7 letters). All of these words are used to emphasize the truthfulness of a statement, and they all have the same meaning as 'No Fooling!'.