dispensable, expendable, inessential, needless, nonessential, redundant, supererogatory, superfluous, surplus to requirements, uncalled-for, unneeded, unrequired, useless
essential, indispensable, necessary, needed, required, vital
English Collins Dictionary - English synonyms & Thesaurus
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"