difficult
hard
Herculean
abstruse
allergic
anaphylactic
arduous
awkward
brutal
capricious
changeable
complex
critical
dangerous
delicate
demanding
desultory
difficile
empathetic
empathic
exacting
fickle
formidable
fragile
goosy
hairy
hard-earned
hard-fought
hazardous
high-strung
hyperesthetic
hyperpathic
hypersensitive
infirm
insecure
insubstantial
intricate
irritable
itchy
jawbreaking
knotted
knotty
laborious
mean
mercurial
miffy
nervous
nice
bariatric
chancy
chary
daunt
debatable
dicey
disadvantageous
endanger
fishy
indelicate
midway
onerous
rarified
risky
stressful
time-consuming
touchy
tricky
unenviable
unwell