The word "caused ennui" implies a feeling of boredom, dissatisfaction, or weariness that comes as a result of a certain situation or experience. Some antonyms for this phrase would be "excited interest", "captivated fascination", "stimulated enthusiasm", or "aroused curiosity". These antonyms suggest a sense of engagement and enjoyment that come from experiencing something new, interesting, or challenging. Instead of feeling bored or disinterested, these words imply a feeling of excitement and intrigue that can uplift spirits and leave one feeling motivated and energized. Expanding one's vocabulary with these antonyms can help to shift one's mindset towards positivity and excitement, rather than boredom and monotony.