implacable

/-ˈpleɪ-/

adjective

Not able to be placated or appeased.
Similar: impacable, irreconcilable, unassuageable, unplacable, unpleasable
Impossible to prevent or stop; inexorable, unrelenting, unstoppable.
Similar: relentless, unremitting, unyielding
Adamant; immovable.

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