The term Yawn Producer can be summarized by two crossword solutions: ENNUI (5 letters) and BORE (4 letters). ENNUI is a French word meaning a feeling of listlessness and dissatisfaction resulting from a lack of interest; it is often used to describe boredom. BORE, on the other hand, is an English word meaning to make someone feel tired or bored by being dull or monotonous. Both words are used to describe someone or something that produces yawns.