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Impossible to alter; unchangeable: the inalterable routine of a physician.

in·al′ter·a·bil′i·ty n.
in·al′ter·a·bly adv.
References in periodicals archive ?
While Emma is denied any glimmer of self-awareness, Edna becomes aware both of the inalterability of her temporal limitations and of her intense desire--even need--to alter or escape those limitations.
Those newly-made approaches give us an opportunity for further measurements of iris pattern's inalterability and improvement of existing algorithms.
The resulting structure is then immune to rules causing lenition because of geminate inalterability (Guerssel 1977; Hayes 1986; Schein and Steriade 1986; Inkelas and Cho 1993; Keer 1999; Kirchner 2000).