subextremal
subextensive
submillimolar
detractive
slack
slack off
small indefinite amount
die away
let up
undercalculate
submegabit
microelution
undermeasure
abate
lessening
small indefinite quantity
underrate
waning
insignificant
subpolynomial
low
dinky
nonexponential
cutback
subarcminute
under
subdetectable
short of
hypodivergent
aleph-zero
undersaturate
small-time
aleph-nought
aleph-null
in miniature
undercompressive
lowset
microadjustment
unanalytic
low-set
infraoptimal
hypomutated
hypoexpression
hypoproliferative
subgigabit
scanty
pennies on the dollar
deceleration