Webster's Revised Unabridged Dictionary · 1913

Inexorable

Inexorable , adjective

[Latin inexorabilis: compare French inexorable. See In- not, and Exorable, Adore.]

Not to be persuaded or moved by entreaty or prayer; firm; determined; unyielding; unchangeable; inflexible; relentless; -- of people and impersonal forces; as, an inexorable prince or tyrant; an inexorable judge; the inexorable advance of a glacier.
Inexorable equality of laws. — Gibbon
Death's inexorable doom. — Dryden
You are more inhuman, more inexorable, O, ten times more than tigers of Hyrcania. — Shakespeare