unappreciative
unrewarding
bitter
bootless
careless
despised
disagreeable
dislikable
disliked
displeasing
distasteful
fruitless
futile
heedless
lowly
miserable
misprized
misunderstood
out of favor
profitless
self-centered
sour
thoughtless
ugly
unacceptable
unacknowledged
unalluring
unappealing
unappetizing
unappreciated
unattractive
uncared-for
undelectable
undelicious
undesirable
unengaging
unenjoyable
ungrateful
uninviting
unlamented
unlikable
unmindful
unmissed
unmourned
unpalatable
unpleasant
unpleasing
unpopular
unprofitable
unregretted
Herculean
arduous
back-breaking
daunt
frustrate
inefficient
invidious
irksome
menial
onerous
perilous
time-consuming
toilsome
uncongenial
undignified
unenviable
uninteresting
unpromising
wearisome
thankful