Comparative form of draughty: more draughty(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "draughtier" in a sentence
"But still she demurred, being a very sane, intelligent girl, with an imagination which produced no more alluring mental picture than a cold and draughty drive, a colder and draughtier and even more depressing inspection of a ruined factory, and such small matters as a lost lunch."