a. (UN-1 7 b.)
1846. Worcester (citing F. Butler).
1832. Fr. A. Kemble, Jrnl. Resid. in Amer. (1835), 224. The greater number [of women] cuddle round a stove, the heat of which alone would make the atmosphere unbreathable.
1862. Cornh. Mag., VI. 485. No one pretends that the worst air in a closed railway carriage is unbreathable.
c. 1882. Chr. Rossetti, Resurgam, Poems (1891), 378. He stumbles on the darkened mountain-head, Left breathless in the unbreathable thin air.
