bearable
endurable
resistant
satisfactory
sufferable
supportable
tolerant
OK
acceptable
adequate
admissible
all right
allowable
average
better than nothing
betwixt and between
common
considerable
decent
dull
fair
fair to middling
fairish
good enough
goodish
indifferent
inferior
insipid
lackluster
livable
mediocre
medium
middling
moderate
modest
namby-pamby
not amiss
not bad
not half bad
not so bad
of a kind
of a sort
of sorts
okay
ordinary
passable
presentable
pretty good
respectable
run-of-the-mill
so so
tolerance
approximate
astonish
comparative
outward
reasonable
substantial
sufficient
uncommon
unfailing
utmost
intolerable