Falsely
From BiblePortal Wikipedia
King James Dictionary [1]
Falsely, adv. fols'ly.
1. In a manner contrary to truth and fact not truly as, to speak or swear falsely to testify falsely. 2. Treacherously perfidiously.
Swear to me - that thou wilt not deal falsely with me.
Genesis 21 .
3. Erroneously by mistake.
Webster's Dictionary [2]
(adv.) In a false manner; erroneously; not truly; perfidiously or treacherously.