mal-
vacuitous
underproductivity
wanty
nit
shortcoming
rough edges
disaffiliative
leanness
meagerness
scantness
scantiness
shortfalling
exiguity
poorness
shan
meagreness
nondifferentiation
inadequateness
inadequacy
negligibleness
leave a lot to be desired
negligibility
slender
decrescent
lacklusterness
underperformance
meanly
wimpish
wimpy
nonratable
mediocre
down
under-
weak
easeless
depth
deficiently
undersatisfaction
unsatisfactory
lackadaisicality
unassimilating
slenderness
lowth
stultified
nondifferentiability
nonefficiency
narrowingness
poor
fleetingness