boring
deadening
dull
earthbound
ho-hum
insipid
institutional
irksome
jejune
narcotic
pedestrian
ponderous
prosaic
prosy
putdownable
slow
soporiferous
soporific
tedious
tiresome
wearisome
arid
barren
drearisome
dreary
dry
dry-as-dust
featureless
flat
tasteless
bore
colorless
commonplace
disagreeable
distasteful
ineffective
irrelevant
lifeless
meaningless
monotonous
trivial
unattractive
uneventful
unsatisfactory
interesting