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a. Not adhering to promises, obligations, or allegiances; disloyal. See Synonyms at faithless.
b. Breaking trust in a marriage or relationship by having sexual relations with someone other than one's spouse or sexual partner.
2. Not justly representing or reflecting the facts or a primary source; inaccurate: an account that was unfaithful to what really happened; a translation that was unfaithful to the original.

un·faith′ful·ly adv.
un·faith′ful·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.unfaithfully - in an unfaithful undependable unreliable mannerunfaithfully - in an unfaithful undependable unreliable manner
dependably, faithfully, reliably - in a faithful manner; "it always came on, faithfully, like the radio"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
Thirdly, the danger of being unfaithfully counselled, and more for the good of them that counsel, than of him that is counselled.
And not to be overlooked, Kon Ichikawa's Odd Obsession and, from these shores, Unfaithfully Yours by Preston Sturges.
He worked in the Thirties and the Forties when he turned out such marvellously funny and meaningful pictures as If I Were King, The Great McGinty, The Lady Eve, The Miracle of Morgan's Creek, The Sin of Harold Diddlebock (with Harold Lloyd) and Unfaithfully Yours.
Unfaithfully Yours is one of the finest - and most overlooked albums ever to come out of Northern Ireland.
The cloud server has motivation of behaving unfaithfully and returning incorrect results.
If Congress intends that the courts ignore Twombly and Iqbal but preserve these other decisions and their notice-plus pleading approach, then the courts will be relegated to using an amorphous body of precedent that carries Conley's strongly plaintiff rhetoric but which applies it unfaithfully. Senate Bill 1504 would thus deprive the courts of Iqbars useful analytical framework for evaluating Rule 12(b)(6) motions and would restore the ambiguous pleading practice that existed pre-Twombly.
Criterion's release of "Unfaithfully Yours" is thus reason to celebrate.
The latest release, Unfaithfully Yours (Blue Rhythm), appeared in 2002 with reviews which compared the leader to the great Etta James.
The rest of the set comprised a nicely balanced mix of covers, including Willie Dixon's Built For Comfort and the Etta James standard, I'll Sing The Blues For You, and several original numbers, notably the boogiebased Dog and the upbeat Shoppin', which features on the band's latest, highly acclaimed album, Unfaithfully Yours.
And it is a book so poorly written, so carelessly edited and so unfaithfully translated that the reader must struggle through every page, battling lack of interest and disbelief.
No, I've just eaten.' SEARCH OUT - 'Ring Worm' (youtube) GENERAL FIASCO UNFAITHFULLY YOURS (2012) The concept of the dreaded second album - or the sophomore slump - it's a very real thing.
A dramatic turn in "Six Weeks" was ill conceived, though he had some good slapstick moments in works such as "Romantic Comedy," "Lovesick," (a remake of Preston Sturges' "Unfaithfully Yours") and Edwards' "Micki & Maude." But he never found a comedy with the mass appeal of "Arthur," certainly not its 1988 sequel, "Arthur 2: On the Rocks," nor "Best Defense," "Santa Claus: The Movie," "Like Father, Like Son" and 1990's "Crazy People." The '90s found him only appearing onscreen intermittently in forgettable movies like "Blame It on the Bellboy," "The Pickle," "Parallel Lives" and "The Disappearance of Kevin Johnson."