perniciously Synonyms

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