I. “+ adjective
1. : not essential : dispensable , unimportant
unessential illustrations
other freedoms … seem vague and unessential — E.H.Erikson
2. archaic : void of essence : having no real being : insubstantial
the void profound of unessential night — John Milton
II. noun
: something that is unessential or that can be dispensed with as unimportant or unneeded
not … waste time in attacking unessentials — F. Tennyson Jesse