Synonyms of underhandedly
- 2 Syllables
- slyly, quietly, hush-hush
- 3 Syllables
- stealthily, privily, secretly, untruly, falsely, covertly, basely, unduly, faithlessly, roguishly
- 4 Syllables
- insidiously, furtively, privately, unobserved, untruthfully, mendaciously, deceivingly, obscurely, illegally, personally, traitorously
- 5 Syllables
- surreptitiously, confidentially, clandestinely, intimately, falseheartedly, malevolently, indecorously
- 7 Syllables
- disproportionately