Un-truthfully refers to a state of dishonesty, deceitfulness, or falsity. There are various synonyms that can be used in place of un-truthfully such as mendaciously, falsely, untruthfully, dishonestly, deceitfully, insincerely, and disingenuously. Each word carries a slightly different connotation, but they all imply a departure from honesty and truthfulness. A person who acts in an untruthful way may be attempting to deceive others, hide a mistake, or avoid responsibility for their actions. Using synonyms for un-truthfully can add precision and nuance to writing or speech, helping to communicate a more accurate depiction of the situation.