irretrievable vs unretrievable

irretrievable and unretrievable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
irretrievable	No	Yes	No	No
unretrievable	No	Yes	No	No

As adjectives, irretrievable and unretrievable are synonyms defined as:

irretrievable and unretrievable: impossible to recover or recoup or overcome

irretrievable (adjective)	unretrievable (adjective)
impossible to recover or recoup or overcome	impossible to recover or recoup or overcome