Sentence:  Sometimes she passed down avenues of <WSD>sedate</WSD> mansions, soberly numbered ‘one', ‘two', ‘three', and so on right up to two or three hundred, each the copy of the other, with two pillars and six steps and a pair of curtains neatly drawn ... 
Meaning of the word marked with <WSD> tags:  Not overly ornate or showy.