immature
uninteresting
unwholesome
Lenten
Spartan
abstemious
acarpous
ankle-deep
arid
ascetic
attenuated
austere
banal
barren
blah
bland
blank
bloodless
cadaverous
celibate
characterless
childish
childless
cold
colorless
corpselike
cursory
dead
depthless
desert
desolate
dilute
diluted
dismal
draggy
drained
drearisome
dreary
dried-up
dry
dryasdust
dull
dusty
dwarfed
dwarfish
effete
elephantine
emacerated
emaciate
emaciated
empty
commonplace
disingenuous
distasteful
dry-as-dust
highly-coloured
inarable
inconclusive
insipid
no-self
observation
over-educated
profitless
prosy
semiarid
silent
trite
unfruitful
unhealthful
uninspired
uninviting
unsatisfying
vapid