相關(guān)單詞近義詞 unpopular 不流行的, thankless 不感謝的, unrewarding 無(wú)報(bào)酬的, unacknowledged 不被人承認(rèn)的..., difficult 困難的, trying 難受的, ungratifying 忘恩負(fù)義的, unvalued 不受重視的, unsung 未被唱的臨近詞una, Unacid 返回 unappreciated