common
commonplace
down-to-earth
dull
earthy
flat
hard
hard-boiled
hardheaded
humdrum
insipid
matter-of-fact
mundane
ordinary
pedestrian
plain
poetryless
positivistic
practical
practical-minded
pragmatic
prosaic
prosing
prosy
rational
realist
realistic
reasonable
sane
scientific
scientistic
secular
sensible
sober
sober-minded
sound
sound-thinking
straight-thinking
tiresome
unembellished
unideal
unimaginative
unimpassioned
unpoetic
unromantic
unsentimental
vapid
worldly