= trouble, adj. 1.

Of a fluid: thick in consistency, thick with particles. Obsolete.

Dark, gloomy, deficient in light. Of air: obscured or darkened, esp. by mist or fog. Of mist: dense, thick. Obsolete.

Clouded with, or consisting of, fine particles resembling mist.

Of the nature of fog; affected by, characterized by, or prone to fog. Also (and earliest) in figurative use. Cf. fog, n.2 1.

Of water, wine, etc., Troubled, turbid, muddy, thick; of air, etc., Misty, murky, cloudy, not clear; in quot. 1400, dim, dusky.

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

Of fluids: Charged with solid or extraneous particles. Of air, mist, etc.: Charged with moisture or odours; dense. rare. †Of a room: Full of…

Of air or clouds: murky, thick. Obsolete.

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 air, the atmosphere, etc.: obscured by mist or vapour; foggy, cloudy. Of mist, clouds, etc., or darkness itself: dense, thick, intense…

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

Of clouds, the atmosphere, etc.: Having the appearance of a solid or unbroken mass; dense, thick, compact. Chiefly poetic.