tasteless
bland
dead
dilute
diluted
distasteful
fade
flat
flavourless
gruelly
ill-flavored
inane
indifferent
insipid
jejune
mild
milk-and-water
pappy
pulpy
sapless
savorless
spiceless
stale
thin
unappetizing
unflavored
unsavory
vapid
washy
watered
watered-down
watery
weak
wishy-washy
barren-looking
bloomless
blue-tinged
edgeless
inflectionless
innutritious
loathesome
molehill
nonjudgmental
odorless
odourless
shitless
slow-acting
soy-based
unembellished
ungarnished
unincumbered
unpowdered
unsatisfying