More Viscous is a term used to describe a liquid that has a higher viscosity, or resistance to flow. GOOIER (6 letters) is an adjective meaning stickier or more adhesive than usual. ROPIER (6 letters) is an adjective meaning having a thicker consistency than normal. SLIMIER (7 letters) is an adjective meaning having a slippery or greasy texture. All three words can be used to describe a liquid that is more viscous than usual.