Sentence:  “Well,” I answered, at first with <WSD>uncertainty</WSD>, then with inspiration, “he would do splendidly to lead your cotillon, if you think of having one.” &para; “So you do not dance, Mr. Crocker?” &para; I was somewhat set back by her perspicuity. 
Meaning of the word marked with <WSD> tags:  Doubt; the condition of being uncertain or without conviction.