Source : Webster's Revised Unabridged Dictionary (1913)

Viscous \Vis"cous\, a. [L. viscosus. See {Viscid}.]
   Adhesive or sticky, and having a ropy or glutinous
   consistency; viscid; glutinous; clammy; tenacious; as, a
   viscous juice. -- {Vis"cous*ness}, n.

   Note: There is no well-defined distinction in meaning between
         viscous and viscid.

Source : WordNet®

viscousness
     n : resistance of a liquid to sheer forces (and hence to flow)
         [syn: {viscosity}]