Viscous Having a thick, sticky consistency between solid and liquid; having a high viscosity. See also PEI/RP700 and Viscosity. By rhys|2014-10-23T14:02:53+00:00October 23rd, 2014|Comments Off on Viscous Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkXingEmail About the Author: rhys