underdeliver
underpromise
lower one's sights
underget
compound
more is more
underprovision
trail behind
fall short
underachieve
less is a bore
mail it in
suboptimally
downshift
dwindle
underimpress
sacrifice
deoptimize
overcontribute
backburner
underconform
lowball
hand out
trashy
rubbishy
throw a sprat to catch a mackerel
sell short
shitty
overpromise
short
plonky
disappoint
underjudge
downwards
premium
underappraise
underperform
disincline
undervalue
undercommit
underreckoning
underestimation
undercode
counterincentive
underrating
undersubscribe
underallocation
subefficacious
underestimate
underbound
punch below one's weight
undersend
underrate
underprioritize
easy
understate
poorly
undergain
underbuy
come across with
take for granted
underrespond
devalue
cool
disvalue
inexpediency
basen
fall
vouchsafe
minimalist
depreciate
downward
downrate
rampant
shortfalling
disappointment
Clemson
low-key
potato
outpromise
resign
undermargin
volunteer
suboptimum
degrade
dim
write off
get by
depressed
decondition
disappreciate
underfeel
soft bigotry of low expectations
dog it
black
bleak
underadvantaged