malicious
toxic
acerbic
acrid
acute
antagonistic
antipathetic
baleful
baneful
belligerent
bitter
catching
caustic
clashing
colliding
communicable
conflicting
contagious
corroding
corrosive
corrupting
corruptive
counterproductive
cutting
damaging
dangerous
deadly
deleterious
despiteful
destructive
detrimental
disadvantageous
disserviceable
distressing
drastic
embittered
envenomed
excessive
exorbitant
extravagant
extreme
fierce
full of hate
furious
great
harmful
hateful
hostile
hurtful
immoderate
infectious
infective
devilish
envious
feral
loathsome
malevolent
murderous
nasty
poisonous
predatory
spiteful
vengeful
vicious
vindictive
virulent
non-venomous