Sentence:  For some time, I, in common with many others, considered this fascinating writer as having done an <WSD>unrewardable</WSD> service to his age, by the death blow he has given to that host of female scribblers who did much worse than waste the paper ... by their voluminous tomes of sentimental nonsense ... 
Meaning of the word marked with <WSD> tags:  For which no reward would be sufficient.