conventional
alike
automatic
average
back-number
banal
beaten
besetting
bewhiskered
bromidic
cliche
cliched
common
commonplace
constant
corny
current
cut-and-dried
dominant
epidemic
fade
familiar
frequent
fusty
habitual
hackney
hackneyed
indiscernible
indistinct
indistinctive
indistinguishable
interchangeable
moth-eaten
musty
normal
old hat
ordinary
overworked
pandemic
persistent
platitudinous
popular
predominant
predominating
prevailing
prevalent
rampant
recurrent
recurring
regnant
regular