un ‧ re ‧ ward ‧ ed /ˌʌnrɪˈwɔːdəd◂, ˌʌnrɪˈwɔːdɪd◂ $ -ˈwɔːr-/ BrE AmE adjective
[ Word Family: adjective : ↑ rewarding ≠ UNREWARDING , ↑ unrewarded ; verb : ↑ reward ; noun : ↑ reward ]
not achieving what you want to achieve:
His efforts have not gone unrewarded.