ordinary
amidships
average
banal
betwixt and between
central
common
core
dull
equatorial
equidistant
fair
fair to middling
fairish
halfway
indifferent
inferior
insipid
interior
intermediary
intermediate
lackluster
mean
medial
median
mediocre
mediterranean
medium
mesial
mezzo
mid
middle
middle-of-the-road
middlemost
midland
midmost
midships
midway
moderate
modest
namby-pamby
normal
nuclear
of a kind
of a sort
of sorts
commodity
good
trade good
arable
comparable
down-and-out
half-baked
humbler
inconsiderable
landowning
neighbouring
passable
second-rate
seemly
so-so
tolerable
unequal
vulgar-looking
well-off
well-to-do
fiddling
piddling
twiddling