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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.
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"
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.
On Thursday, Al-Enezi was decoyed by two cousins, Saad Radhi Ayash Al-Enezi, 21, and Abdulaziz Radhi Ayash Al-Enezi, 18, residents of Al-Shamly province, an affiliate of Hail Governorate, where they unfaithfully killed him.
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.
Additional feature film credits include, Paradise Alley, Little Darlings, Private Benjamin, I, The Jury, Unfaithfully Yours, The Penitent, Fatal Instinct, Trial By Jury, Judge Dredd, Two for the Money and many independents.
To the extent a Justice who disagrees with a precedent nevertheless adopts it but applies it unfaithfully, or attempts to twist the precedent to accommodate the outcome he seeks, future holdings become unnecessarily narrow and confusing.
We can preach faithfully, for example, and we can preach unfaithfully.
While some unfaithfully baptized infants in the early church, others faithfully baptized adults.
Similarly, when the image of Christ Pantocrator is used to sanction the rule of political, ecclesiastical, or patriarchal authorities, it is unfaithfully, and indeed, idolatrously represented.
cities, D'Angelo's artistic career and personal life points to some of the more intangible aspects of subjection, representing a life literally stripped bare, a life devoid of access and legitimate authority, symbolically existing at the absolute minimum end of the circulation of power and yet, at the same time, displaying how unfaithfully black male subjects have internalized those same annihilating aims.