Synonyms of falsely

3 Syllables
untruly, crookedly, erringly, basely, disloyally, faithlessly, roguishly
4 Syllables
untruthfully, mendaciously, deceivingly, incorrectly, mistakenly, maliciously, dishonestly, perfidiously, traitorously, treacherously, unfaithfully
5 Syllables
dishonorably, falseheartedly, malevolently, unscrupulously, underhandedly