Of a liquid or a pasty substance: Of slight density or consistence; fluid; of air or vapour: not dense; rare, tenuous, subtile. Opposed to thick, adj.…

Esp. of a gas or liquid: thin (in consistency); not dense; not viscous; clear. Also: penetrating or pervasive by reason of lack of density. See also…

Of a liquid mixture generally: weak, thin. Obsolete.

Of a fluid: Not rigid, yielding. Of winds: Variable in direction, shifting. Obsolete.

Of liquids: Not viscous. (Cf. long, adj.1 4.)

Esp. of air, gas, or liquid: thin and fluid; lacking substance; = subtle, adj. 11. Now rare.

Scottish. Thin, watery.

Not possessing viscosity.