Synset

not necessary
<adj.all> freq. cnt.: 6 freq. cnt.: 5 freq. cnt.: 1

lexical pointers

antonym

semantic pointers

also see

inessential, unessential

attribute

similar to

surplus, excess, extra, redundant, spare, supererogatory, superfluous, supernumerary needless, gratuitous, uncalled-for inessential spare