acerbity
acid
acidity
acidness
acidulousness
acridity
animosity
animus
antipathy
asperity
astringency
bad blood
bile
bite
bitingness
bitter feeling
bitter resentment
bitterness
bitterness of spirit
causticity
causticness
choler
corrosiveness
edge
enmity
feud
fierceness
gall
gnashing of teeth
grip
hard feelings
harshness
hatred
heartburning
heat
ill blood
ill feeling
ill will
incisiveness
keenness
malevolence
malice
malignity
mordacity
disagreeableness
aversion
bicker
disdain
displeasure
dissension
exasperation
irritability
rancor
recrimination
sarcasm
sensitiveness
sharpness
solicitude
trepidation
uneasiness
virulence
friendship
peace