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unfaithfully
01
in a manner characterized by a lack of loyalty, betrayal, or violation of trust
Example
He unfaithfully broke his promise by sharing confidential information with competitors.
He unfaithfully cheated on the exam by using unauthorized materials during the test.
She unfaithfully neglected her responsibilities, failing to complete the assigned tasks on time.
Despite being entrusted with financial matters, he unfaithfully embezzled funds from the company.
Despite the vows they exchanged, she unfaithfully engaged in a romantic relationship with someone else.