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Webster 1913 Edition

Adj.

Having no roof;

as, a

roofless

house

Having no house or home; shelterless; homeless.

Adj.

Having no roof; as a roofless house.

Having no house or home; unsheltered.

roofless ‎(not comparable)

Without a roof, open to the sky.
Before the tornado we had a dining room with a skylight; after it we had a roofless home with too much ventilation.