Sentence:  The Administrator sent me here on a crazy errand, killing an unknown <WSD>underperson</WSD>. I find out that the person is really a little girl. Then I find out that she is not an <WSD>underperson</WSD>, but a frightening old dead woman, still walking around alive. 
Meaning of the word marked with <WSD> tags:  A member of a subhuman sentient species.