Suízhe shíjiān tuīyí, tā de rèqíng jiànjiàn xiāotuì.
As time passed, his enthusiasm gradually faded.
Tips
usage
消退 is used for gradual disappearance of both physical phenomena (swelling, floods) and abstract ones (enthusiasm, interest). Compare with 消失 (disappear completely) and 减退 (decrease/decline).
