If you regard someone or something as expendable, you think it is acceptable to get rid of them, abandon them, or allow them to be destroyed when they are no longer needed.
Once our services cease to be useful to them, we're expendable..., During the recession, training budgets were seen as an expendable luxury.
Translation English - Cobuild Collins Dictionary
dispensable, inessential, nonessential, replaceable, unimportant, unnecessary
crucial, essential, indispensable, key, necessary, 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"