difficult
unmanageable
beyond control
breachy
contumacious
defiant
disobedient
fractious
incorrigible
indocile
indomitable
insuppressible
intractable
irrepressible
licentious
obstreperous
out of hand
rebellious
recalcitrant
refractory
resistant
resisting
restive
shrewish
unbiddable
unbridled
uncontrollable
unmalleable
unmoldable
unruly
unsubmissive
wild
causeless
frenzied
headstrong
ill-concealed
irascible
overpower
pent-up
perverse
tempestuous
turbulent
unforgiving
ungoverned
unquenchable
unreasonable
unreasoning
vengeful
vindictive