Ennui

The thrill was gone.  The bloom was off the rose.  The.. meh.  He couldn't be bothered to continue that train of thought.

Leaning back on his piano stool, listlessly plinking the keys, William wondered (carelessly) whether his moroseness was detectable to the outside world... "Aw, who cares, anyway...?"

(I am all fired up to make a sweater like that, now!  Inspired!  And it's all thanks to you, Mr. Model!)