armed
difficult
hard
Herculean
abstruse
acanaceous
acanthoid
aciculate
aculeolate
arduous
barbed
barbellate
brambly
briery
bristly
brutal
complex
complicated
controversial
critical
delicate
demanding
difficile
exacting
formidable
hairy
harassing
hard-earned
hard-fought
intricate
involved
jawbreaking
knotted
knotty
laborious
mean
muricate
nasty
nettlesome
no picnic
not easy
operose
painful
perplexing
pricking
prickle
prickly
pricky
problematic
rigorous
rough
thornier
thorniest
brittle
bushy
evergreen
gnarled
hazel
herbaceous
impenetrable
leafless
leafy
luxuriant
pathless
scrubby
sparse
spiky
spiny
tangle
tropical
waist-high
wither
woody
Horney
Sigourney
corny
horny