untruthfully
Adverb
Meaning
in a mendacious and untruthful manner
Source: WordNetSynonyms
Antonyms
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I told him, quite untruthfully, that I had just returned from leave
“From the start, when the enormity of what you had done and the likely consequences for you struck home, you untruthfully said to the paramedics and a police officer that someone must have thrown a firework into your shop.”
The bill actually requires that the physician state untruthfully on the death certificate that “the cause of death was the underlying terminal illness or condition of the patient.”