armed
Herculean
abstruse
acanthoid
acanthous
acicular
acuate
aculeate
aculeiform
acuminate
acute
arduous
barbed
brutal
complex
cornuted
critical
cusped
cuspidate
delicate
demanding
difficile
difficult
exacting
formidable
hairy
hard
hard-earned
hard-fought
hispid
horned
horny
intricate
jawbreaking
knotted
knotty
laborious
mean
mucronate
needle-pointed
needle-sharp
nettlesome
no picnic
not easy
operose
pointed
prickly
pronged
rigorous
rough
spinier
spiniest
spinny
spine
bristly
broad-leaved
bushy
deciduous
feathery
fleshy
furry
gnarled
leafless
low-growing
prickly pear
reddish
saguaro
scaly
scrawny
sparse
spiky
spinous
stubby
succulent
thorny
woody
piny
shiny
tiny
whiny
winey