Sentence:  “A tight little craft,” was Austin's invariable comment on the matron; and she looked it, always trim and trig and <WSD>smooth</WSD> of surface like a converted yacht cleared for action. ¶ Near her wandered her husband, orientally bland, invariably affable,nb.... 
Meaning of the word marked with <WSD> tags:  Having a texture that lacks friction. Not rough.