Main entry: inessential, nonessential
Definition: anything that is not essential
Usage: they discarded all their inessentials
Antonyms: necessary, necessity, essential, requirement, requisite
Definition: anything indispensable
Main entry: unessential, inessential
Definition: not basic or fundamental
Antonyms: essential
Definition: basic and fundamental
Antonyms: basic
Definition: pertaining to or constituting a base or basis
Main entry: inessential
Definition: not absolutely necessary
Antonyms: necessary
Definition: absolutely essential