unkind
acanaceous
acerb
acerbate
acerbic
acid
acidic
acidulent
acidulous
acrid
acrimonious
aculeolate
acute
afflictive
agonizing
asperous
astringent
atrocious
biting
bitter
brambly
briery
brisk
bristly
burn
burning
burning pain
buzz
caustic
chafing
corroding
corrosive
cramping
cruel
cutting
distressing
double-edged
edged
escharotic
excruciating
fierce
fire
fretting
galling
gnawing
grating
grave
grinding
griping
hard
hurting
pain
bringing
clinging
flinging
pinging
ringing
singing
slinging
springing
stringing
swinging
winging
wringing