| Main Entry: | |
| Part of Speech: | adverb |
| Definition: | deceitfully |
| Synonyms: | basely, behind one's back, crookedly, dishonestly, dishonorably, disloyally, faithlessly, falseheartedly, malevolently, maliciously, perfidiously, roguishly, traitorously, treacherously, underhandedly, unfaithfully, unscrupulously |
| Antonyms: | honestly, truthfully |