tasteless
bland
dead
dilute
diluted
distasteful
fade
flat
flavorless
gruelly
ill-flavored
inane
indifferent
insipid
jejune
mild
milk-and-water
pappy
pulpy
sapless
spiceless
stale
thin
unappetizing
unflavored
unpleasing
unsavory
vapid
washy
watered
watered-down
watery
weak
wishy-washy
barren-looking
bloomless
doll-like
innutritious
inodorous
loathesome
market-day
mawkish
odorless
odourless
pacifistic
played-out
scentless
self-pitying
slow-acting
snakish
three-act
tragi-comic
two-three
unstimulating
well-acted