The definition of an apostasy is the act of leaving behind, or straying from, your religious or political beliefs or your principles.
The malicious intention to be dishonest or to violate the law, as in negotiations over a contract.
A failing or failure
Willful neglect, as of duty or principle.
An instance of being eccentrically variable or fickle.
An act of sexual unfaithfulness.
Deliberate breach of faith; calculated violation of trust; treachery:
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Treason is the act of betraying your country or a betrayal of trust.
Something false; esp., a lie
Fidelity is defined as being loyal or faithful, or an accurate copy.
The definition of errant is straying from the normal course or not following guidelines or standards.
Breaking trust in a marriage or relationship by having sexual relations with someone other than one's spouse or sexual partner.
Difficult or impossible to manage, control, or keep in order:
Find another word for unfaithfulness. In this page you can discover 29 synonyms, antonyms, idiomatic expressions, and related words for unfaithfulness, like: apostasy, bad faith, defection, dereliction, disloyalty, fickleness, improbity, inconstancy, infidelity, perfidy and recreancy.