The term 'not very interesting' can be summarized by three crossword solutions: BLAH (4 letters), DRY (3 letters), and VAPID (5 letters). BLAH is an informal expression used to describe something that is dull, uninteresting, or tedious. DRY is an adjective meaning lacking in liveliness, animation, or interest. VAPID is an adjective meaning lacking in flavor, zest, or vigor. All three words are used to describe something that is not very interesting.