If you say that someone or something is indispensable, you mean that they are absolutely essential and other people or things cannot function without them. adj oft ADJ to n
(=essential) (Antonym: dispensable)
She was becoming indispensable to him.
Translation English Cobuild Collins Dictionary
crucial, essential, imperative, key, necessary, needed, needful, requisite, vital
dispensable, disposable, nonessential, superfluous, unimportant, unnecessary
English Collins Dictionary - English synonyms & Thesaurus
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