Antonyms of adj viscous

2 senses of viscous

Sense 1
syrupy, viscous -- (having a relatively high resistance to flow)

INDIRECT (VIA thick) -> thin -- (relatively thin in consistency or low in density; not viscous; "air is thin at high altitudes"; "a thin soup"; "skimmed milk is much thinner than whole milk"; "thin oil")

Sense 2
gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscid, viscous -- (having the sticky properties of an adhesive)

INDIRECT (VIA adhesive) -> nonadhesive -- (not tending to adhere)

Similarity of adj viscous

2 senses of viscous

Sense 1
syrupy, viscous -- (having a relatively high resistance to flow)
       => thick (vs. thin) -- (relatively dense in consistency; "thick cream"; "thick soup"; "thick smoke"; "thick fog")

Sense 2
gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscid, viscous -- (having the sticky properties of an adhesive)
       => adhesive (vs. nonadhesive) -- (tending to adhere)