Sentence:  He was a pale, lean, acute, undeveloped little <WSD>cosmopolite</WSD>, who liked intellectual gymnastics and who, also, as regards the behaviour of mankind, had noticed more things than you might suppose, but who nevertheless had his proper playroom of superstitions, where he smashed a dozen toys a day. 
Meaning of the word marked with <WSD> tags:  One who is at home in every place; a citizen of the world; a cosmopolitan person.