1. 未被欣赏的：unappeasable 不能满足的 | unappreciated 未被欣赏的 | unapprehended 未被逮捕的

2. 未得赏识的：unapplicable 不适用的 | unappreciated 未得赏识的 | unapprehended 不理解的

3. 未受赏识的：unappliedincome 未分配收入 | unappreciated 未受赏识的 | unapprehended 未被领会的

4. 未受赏赐的;不被领情的：tyrannical暴君的;专制的;暴虐的 | unappreciated未受赏赐的;不被领情的 | unbroken unchaste不贞节的,不正经的; impure

1. having value that is not acknowledged

    Synonym: unsungunvalued

2. not likely to be rewarded

    e.g. grading papers is a thankless task

    Synonym: thanklessungratifying