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Longman Dictionary of Contemporary English
unpardonable
adjective
EXAMPLES FROM CORPUS
▪ That would be seen by many as an unpardonable failure that disqualifies him from having a second run.
▪ To some it is even the ultimate treason against faith, the unpardonable sin.
The Collaborative International Dictionary
Unpardonable

Unpardonable \Un*par"don*a*ble\, a. Not admitting of pardon or forgiveness; inexcusable.

Douglas Harper's Etymology Dictionary
unpardonable

1520s, from un- (1) "not" + pardonable (adj.). Related: Unpardonably.

Wiktionary
unpardonable

a. impossible to pardon; impossible to excuse or justify

WordNet
unpardonable

adj. not admitting of pardon; "unpardonable behavior" [ant: pardonable]

Usage examples of "unpardonable".

But the rising sedition was appeased by the authority and eloquence of the general: and he represented to the assembled troops the obligation of justice, the importance of discipline, the rewards of piety and virtue, and the unpardonable guilt of murder, which, in his apprehension, was aggravated rather than excused by the vice of intoxication.

I am sure it would be unpardonable in me to do otherwise, who have tasted so bitterly of the misfortunes attending such marriages.

Dylan could only glare, his curiosity mingled with the certainty that he and Arthur Lomb were more objectionable, more unpardonable, together than apart.

I hereby inform you that the deserter and turbulent Cossack of the Don, Imiliane Pougatcheff, after having been guilty of the unpardonable insolence of usurping the name of the deceased Emperor Peter III, has assembled a troop of brigands, disturbed the villages of the Iaik, and has even taken and destroyed several fortresses, at the same time committing everywhere robberies and assassinations.

The widow whom you have treated badly has played you some trick which has involved you with your mistress, and then the wretched woman has 477 left your house with the most unpardonable rudeness this tortures you.

Imprudence or thoughtlessness in money matters would be unpardonable in me.

I wished, as I had the honor to say to you, to witness a religious service in the great mosque at Constantinople, and by my prayers, supported by a handful of gold pieces, I succeeded in convincing the Turk, who had the care of the key to the superb Sophia, that it was not an unpardonable sin to allow an unbelieving Christian to witness the holy worship of an unbelieving Mussulman.

He was standing in the door, the figure of vulgar comedy, with ruffled hair, reddened face and unpardonable confusion of attire -- no trace there of the immaculate Robert Walmsley, the courted clubman and ornament of select circles.

If a single loophole were left him, he would be unpardonable, not for disbelieving the story, but for believing it.

Both James and Dolley hated the institution, considering it not only a denial of democracy but a grievous, unpardonable sin.

If Sowerby had been trapped and was already dead, the knowledge would creep through the bazaars like a soft wind of the night, and all the Arab world would rejoice that a cursed Inglesi, making the unpardonable breach of their code, had been given to the crocodiles, been smothered, or stabbed, or tortured to death with fire.

It was an unpardonable mistake, as the two women differed as much as white does from black, and though the darkness forbade my seeing, and the silence my hearing, my sense of touch should have enlightened me-- after the first set-to, at all events, but my imagination was in a state of ecstasy.

Arthur had wanted him to say that Lopez was an unpardonable intruder,--but he had taken the part of Lopez, and therefore, when the time came round, he had nothing to do with the shooting.

This unpardonable carelessness obliged John Mangles to keep a watchful eye ever open.

If it were not that they held that the State originates in convention or the social compact, there would be unpardonable presumption on the part of the present writer in venturing to hazard an assertion contrary to theirs.