Adjective viscous has 2 senses
  1. syrupy, viscous - having a relatively high resistance to flow
    Antonym: thin (indirect, via thick)
  2. gluey, glutinous, gummy, mucilaginous, pasty, sticky, viscid, viscous - having the properties of glue
    Antonym: nonadhesive (indirect, via adhesive)
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