Adjektive
malignant [ more malignant ; most malignant ]
malicious [ more malicious ; most malicious ]
vicious [ more vicious ; most vicious]
malign [ more malign ; most malign]
virulent [ more virulent ; most virulent] , {med.}
fiendish [ more fiendish ; most fiendish ]
sly [ slier/slyer ; sliest/slyest ] , {account.}
tricky [ trickier ; trickiest ]
puckish [ more puckish ; most puckish ]
harmful [ more harmful ; most harmful]
...
Noun