Superlative form of draughty: most draughty.(adjective)
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Use "draughtiest" in a sentence
"And the US Green Building Council has shown that even the oldest, draughtiest accommodation in a dense urban centre provides a more environmentally efficient form of living than an ecohome in a new greenfield location."
"Near her sat the governesses, English, French and German, with little Janetta bringing up the rear in the draughtiest place and the most uncomfortable chair."
"His work was in the same big room, and he took care that Stephen should have the draughtiest corner of it, and be the last to get into the office on pay-day."