decreasing
abating
allaying
alleviating
assuaging
blunting
chastening
contractive
cushioning
dampening
damping
deadening
declining
decrescendo
decrescent
deliquescent
diminuendo
diminutive
dulling
dwindling
dying
easing
ebbing
fading
languishing
lessening
mitigating
on the wane
receding
reducing
reductive
relaxing
retiring
retreating
shrinking
sinking
softening
subduing
subsiding
tempering
waning
finishing
photofinishing
refinishing