Of vapour, mist, etc.: Having the character or appearance of smoke; resembling smoke; smoke-like.

Of air: Foul from admixture of fumes, vapours, etc., stuffy, close; also, dense, not rare or thin. Now rare or Obsolete. (Cf. A. 7.)

Of a vaporous and sulphurous nature.

Of air, smoke, clouds, etc.: Thick, dense; dark.

Dense, thick. (Often with mixture of the sense of branch A. IV.) of air, vapour, darkness. archaic or poetic.