non-essential 
adjective
Not absolutely necessary (tending to be less forceful in meaning than inessential): during the strike non-essential hospital services were halted...
- The doctors attended a rally outside the hospital to vote for bans on non-essential paperwork.
- Under reforms to the pharmaceutical industry's code of conduct, all non-essential hospitality will be axed.
- The city's officials have failed to see that ‘easy’ jobs are not necessarily non-essential jobs.
Synonyms
unnecessary, inessential, unessential, needless, unneeded, not required, superfluous, uncalled for, redundant, dispensable, expendable, peripheral, unimportant, incidental, optional, extraneous, cosmetic;
French de trop
rare supererogatory
noun (usually non-essentials)
A non-essential thing: we have little or no time to spare for non-essentials...
- Sir Clive Woodward was quite correct to attribute his World Cup triumph to critical non-essentials, to the search for small refinements and extra training sessions.
- The budget shows a preferential bias for the non-essentials.
- But, as a society, we also spend enormous amounts on non-essentials: the National Institute of Sport springs to mind, or orchestras or operatic troupes or art galleries and museums.