Antonyms of adj draughty

1 sense of draughty

Sense 1
drafty, draughty -- (not airtight)

INDIRECT (VIA leaky) -> tight -- (of such close construction as to be impermeable; "a tight roof"; "warm in our tight little house")

Similarity of adj draughty

1 sense of draughty

Sense 1
drafty, draughty -- (not airtight)
       => leaky (vs. tight) -- (permitting the unwanted passage of fluids or gases ; "a leaky roof"; "a leaky defense system")