inessential
omissible
parenthetic
parenthetical
peripheral
secondary
subsequent
unessential
accessory
acciaccatura
accident
accidental
accompanying
addendum
addition
additional
adjunct
ado
adrift
adscititious
adventitious
afloat
afoot
aleatory
ancillary
appendage
appoggiatura
appurtenance
appurtenant
arabesque
article
ascititious
aspect
auxiliary
beside the mark
beside the point
beside the question
by-the-way
cadence
cadenza
case
casual
causeless
chance
chancy
circumstantial
collateral
coloratura
conditional
contingency
contingent
count
current
expense
item
point
incidence
incident
extraneous
forego
immediate
indirect
irrelevant
needless
superficial
transitory
trivial
unavoidable
Occidental
Oriental
coincidental
compartmental
continental
dental
departmental
detrimental
developmental
elemental
environmental
experimental
fundamental
gentle
governmental
incremental
instrumental
intercontinental
intergovernmental
judgemental
judgmental
lentil
mental
monumental
nongovernmental
occidental
oriental
ornamental
pancontinental
parental
regimental
rental
sentimental
supplemental
temperamental
transcendental
transcontinental
unsentimental