Antonyms of adj unappreciated

2 senses of unappreciated

Sense 1
thankless, unappreciated, ungratifying -- (not likely to be rewarded; "grading papers is a thankless task")

INDIRECT (VIA unrewarding) -> rewarding -- (providing personal satisfaction; "a rewarding career as a paramedic")

Sense 2
unappreciated, unsung, unvalued -- (having value that is not acknowledged)

INDIRECT (VIA unacknowledged) -> acknowledged -- (recognized or made known or admitted; "the acknowledged leader of the community"; "a woman of acknowledged accomplishments"; "his acknowledged error")

Similarity of adj unappreciated

2 senses of unappreciated

Sense 1
thankless, unappreciated, ungratifying -- (not likely to be rewarded; "grading papers is a thankless task")
       => unrewarding (vs. rewarding) -- (not rewarding; not providing personal satisfaction)

Sense 2
unappreciated, unsung, unvalued -- (having value that is not acknowledged)
       => unacknowledged (vs. acknowledged) -- (not recognized or admitted)