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. This could lead to feeling unappreciated, but your attitude should be award winning.
adj
1. having value that is not acknowledged
2. not likely to be rewarded
e.g. grading papers is a thankless task
Synonym: thankless ungratifying