= indispensable, adj. 2.

That cannot or may not be transgressed.

Of a law, obligation, duty, etc.: That cannot be dispensed with, remitted, set aside, disregarded, or neglected. Also †indispensable with.

= indispensable, adj. n.

Not subject to dispensation.

(un-, prefix1 affix 1. Cf. uninfringible there.)