illogical
unimportant
unlogical
absonant
back-burner
contradictory
contrary to reason
cursory
depthless
dinky
dispensable
fallacious
faulty
few
flawed
footling
immaterial
inappreciable
inauthentic
inconclusive
incongruous
inconsequent
inconsiderable
inconsistent
inessential
inferior
insignificant
invalid
irrational
irrelevant
lightweight
little
loose
low
meager
miniature
minor
minute
negligible
no great shakes
nonessential
nonscientific
not following
not vital
nugatory
paltry
paralogical
petit
petty
frivolous
futile
groundless
impractical
inane
incoherent
ineffective
innocuous
nonsensical
trite
unconnected
uneventful
uninteresting
unpractical
unprofitable
unreal
unrelated
unremarkable
untrue
valueless
confidential
consequential
credential
deferential
differential
essential
existential
exponential
influential
jurisprudential
nonresidential
potential
preferential
presidential
providential
prudential
quintessential
residential
reverential
sequential
tangential
torrential
vice-presidential