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Pronunciation:  `iri'vursubul

WordNet Dictionary
  1. [adj]  impossible to reverse or be reversed; "irreversible momentum toward revolution"
  2. [adj]  impossible to reverse or undo; "an irreversible decree"

IRREVERSIBLE is a 12 letter word that starts with I.


 Synonyms: irrevocable, irrevokable, permanent
 Antonyms: reversible



Webster's 1913 Dictionary
\Ir`re*vers"i*ble\, a.
1. Incapable of being reversed or turned about or back;
   incapable of being made to run backward; as, an
   irreversible engine.

2. Incapable of being reversed, recalled, repealed, or
   annulled; as, an irreversible sentence or decree.

         This rejection of the Jews, as it is not universal,
         so neither is it final and irreversible. --Jortin.

Syn: Irrevocable; irrepealable; unchangeable.

Thesaurus Terms
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