The term LEAST INTERESTING can be summarized by three crossword solutions: ARIDEST (7 letters), DULLEST (7 letters), and DRIEST (6 letters). ARIDEST is an adjective that describes a lack of moisture, while DULLEST is an adjective that describes something that is not interesting or exciting. Finally, DRIEST is an adjective that describes something that is lacking in moisture or humidity. All three words are used to describe something that is not interesting or exciting.