Sentence:  Edward Churchill still attended to his work in a hopeless mechanical manner like a sleep-walker who walks safely on a <WSD>well-known</WSD> round. But his Roman collar galled him, his cossack stifled him, his biretta was as uncomfortable as a merry-andrew's cap and bells. 
Meaning of the word marked with <WSD> tags:  Familiar, famous, renowned or widely known.