perniciously Synonyms

banefully insidiously adversely harmfully dangerously calamitously cancerously cataclysmically deleteriously hurtfully lethally prejudicially ruinously subversively toxically unwholesomely detrimentally noxiously badly balefully destructively evilly fatally inimically injuriously malevolently malignantly malignly pestilently disadvantageously mischievously maliciously maleficently