deceitfully
adverbUK /dɪˈsiːtfəli/
US /dɪˈsiːtfəli/
In a way that tricks people by hiding the truth.
He deceitfully told his teacher that he had finished his homework.
OTHER MEANINGS
2. In a way that is meant to make someone believe something that is not true.
She deceitfully claimed she had never seen the letter.
3. In a sneaky or underhanded manner.
The fox deceitfully crept toward the henhouse.
4. In a way that betrays trust.
He deceitfully shared his friend's secret with everyone.