Sentence:  He took Miss Lynes to supper; he outshone himself in <WSD>vacuitous</WSD> small-talk during the whole time that the meal lasted ; he held undisputed possession of her during that hour especially dear to flirtation, between the time when supper ended and the departure of the guests. 
Meaning of the word marked with <WSD> tags:  Lacking substance; trivial; meaningless.