Sentence:  ... enter Mrs. Raikes ... leading by the hand a little boy in a sailor suit, cap in hand, a thin, <WSD>wafery</WSD>-looking boy, tall for seven years old, but white and wan, with big, dark-grey eyes, restless and shifty, alarmed like a wild thing afraid of the hunters. 
Meaning of the word marked with <WSD> tags:  Like a wafer ("especially", thin, brittle, light).