Sentence:  O to sail to sea in a ship! / To leave this steady unendurable land, / To leave the tiresome <WSD>sameness</WSD> of the streets, the sidewalks and the houses, / To leave you O you solid motionless land, and entering a ship, / To sail and sail and sail! 
Meaning of the word marked with <WSD> tags:  A tiring lack of variety; monotony.