thankless
adjective
[ ˈθaŋkləs ]
• (of a job or task) difficult or unpleasant and not likely to be satisfying or to be appreciated by others.
• "being an umpire is a thankless job"
Similar:
unappreciated,
unrecognized,
unrewarded,
unacknowledged,
unenviable,
difficult,
unpleasant,
unrewarding,
unprofitable,
profitless,
useless,
fruitless,
vain,
futile,
bootless,
