fall off a cliff
determinable
slump
irreliable
dwindling
underequip
declinable
erosion
impersistence
underfurnish
wanty
wear
diminishable
sufficingness
smooth
infraoptimal
cut
underimproved
ineffectiveness
treacherous
imminution
semiviable
underadjust
nonstability
underreactive
lowerable
imperviable
break down
inefficacy
hypoadduction
impaired
nonfailure
rot
law of diminishing returns
meanly
unreliableness
distendable
underchallenge
undermaintain
subefficacious
slacken
undermodification
tenuous
less is a bore
underbound
immoderation
doubtful
lightweight
evirate