The crossword solution for the term SHOW ENNUI is YAWN, which is a four-letter word. Yawning is a reflex action that is usually associated with tiredness, boredom, or lack of interest. It can also be a sign of ennui, which is a feeling of listlessness and dissatisfaction resulting from a lack of interest or excitement. Show ennui, then, is a phrase used to describe a situation in which someone is displaying a lack of interest or enthusiasm.