INDISPENSABLE

indispensable. Indispensable, a. not to be spared, necessary, absolute

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In′dis‐pen″sa‐ble (?), a. [[Pref. in- not + dispensable: cf. F. indispensable.]] 1. 1. Not dispensable; impossible to be omitted, remitted, or spared; absolutely necessary or requisite.
2. 2. (Eccl.) Not admitting dispensation; not subject to release or exemption.
The law was moral and indispensable. Bp. Burnet. 3. 3. Unavoidable; inevitable. Fuller.