Synonyms of unscrupulously

2 Syllables
cruelly
3 Syllables
basely, faithlessly, disloyally, ruthlessly, viciously, falsely, roguishly
4 Syllables
dishonestly, deceitfully, perfidiously, treacherously, unfaithfully, traitorously
5 Syllables
unconscionably, malevolently, unethically, falseheartedly