difficult
disobedient
hard
ill-natured
adversary
adversative
adverse
alien
antagonistic
anti
antipathetic
antithetic
at odds
averse
bearish
beyond control
bitchy
breachy
cankered
cantankerous
churlish
clashing
competitive
complaining
con
conflicting
contradictory
contrary
contumacious
counter
crabbed
cranky
cross
cross-grained
crusty
cursory
cussed
defiant
differing
disaccordant
disagreeable
disagreeing
disinclined
disputatious
disputing
dissentient
dissenting
enemy
excitable
feisty
forced
fretful
choleric
contentious
headstrong
ill-tempered
insubordinate
irascible
mulish
querulous
refractory
restive
skittish
splenetic
sulky
testy
touchy
unmanageable
unruly
unwell
wayward