The term 'BO-O-RING' can be summarized by two crossword solutions, 'YAWN' and 'HOHUM'. YAWN is an expression of tiredness or boredom, usually accompanied by an open mouth and deep inhalation of breath. Hohum is an expression of boredom or indifference, often used to describe something that is dull or uninteresting. Both words are used to describe a lack of enthusiasm or excitement, and are often used to describe something that is tedious or monotonous.