fading — to lose brightness or vividness of color.
waning — to decrease in strength, intensity, etc.: Daylight waned, and night came on. Her enthusiasm for the cause is waning.
failing — Slang. an embarrassing or humorous mistake, humiliating situation, etc., that is subject to ridicule and given an exaggerated importance: Their app update is a massive fail. the condition or quality resulting from having failed in this way: His online post is full of fail. a person who fails in this way.
abating — to reduce in amount, degree, intensity, etc.; lessen; diminish: to abate a tax; to abate one's enthusiasm.
dwindling — to become smaller and smaller; shrink; waste away: His vast fortune has dwindled away.
wilting — to become limp and drooping, as a fading flower; wither.