Sentence:  “Indeed, sir,” answered the lady, with some warmth, “I cannot think there is anything easier than to cheat an old woman with a profession of love, when her <WSD>complexion</WSD> is amorous; and, though she is my aunt, I must say there never was a more liquorish one than her ladyship. ... 
Meaning of the word marked with <WSD> tags:  The combination of humours making up one's physiological "temperament", being either hot or cold, and moist or dry.