decreasing
descending
down
falling off
soft
cadent
cascading
collapsing
coming apart
cracking
crumbling
dangling
decadent
deciduous
declined
declining
declivate
declivitous
declivous
decurrent
degenerate
dependent
depending
descendant
descent
deteriorating
dipping
disintegrating
distillation
down-reaching
downcoming
downfalling
downgoing
downgrade
downhill
downsinking
downward
draining
drip-drop
dripping
drooping
dropping
dwindling
ebbing
effete
fading
failing
falling loosely
fault
flagging
flowing
fall
colling
forestalling
holling
lolling
rising