Sentence:  Now we plunged into a deep shade with the boughs lacing each other overhead, and crossed dainty, <WSD>rustic</WSD> bridges over the cold trout-streams, the boards giving back the clatter of our horses' feet: or anon we shot into a clearing, with a colored glimpse of the lake and its curving shore far below us. 
Meaning of the word marked with <WSD> tags:  Simple; artless; unaffected.