1. in an irrevocable manner
The Collaborative International Dictionary of English v.0.48:
Irrevocable \Ir*rev"o*ca*ble\, a. [L. irrevocabilis: cf. F.
irr['e]vocable. See In- not, and Revoke, and cf.
Incapable of being recalled or revoked; unchangeable;
irreversible; unalterable; as, an irrevocable promise or
decree; irrevocable fate.
Firm and irrevocable is my doom. --Shak.
-- Ir*rev"o*ca*ble*ness, n. -- Ir*rev"o*ca*bly, adv.
WordNet (r) 3.0 (2006):
adv 1: in an irrevocable manner
Moby Thesaurus II by Grady Ward, 1.0:
35 Moby Thesaurus words for "irrevocably":
absolutely, certainly, clean, fatefully, indefeasibly, ineluctably,
inescapably, inevasibly, inevitably, inexorably, inflexibly,
irreclaimably, irrecoverably, irredeemably, irremediably,
irreparably, irretrievably, irreversibly, necessarily, perfectly,
plain, plumb, quite, relentlessly, right, sheer, stark, surely,
unavoidably, uncontrollably, unpreventably, unrelievedly,
unsalvably, unsalvageably, unyieldingly