Absolutely necessary or requisite; that one cannot do without.
An indispensable component of a heart-healthy diet.
Unbendable, that cannot be set aside or ignored.
The law was moral and indispensable.
Not admitting ecclesiastical dispensation; not subject to release or exemption; that cannot be allowed by bending the canonical rules.
A thing that is not dispensable; a necessity.
Trousers.
Borrowed from Middle French indispensable, from Medieval Latin indispensābilis, corresponding to in- + dispensable.
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