scaleless

adjective4

1. •
   Not having scales.

   • There are also some surprises such as Eurotamandua, a scaleless pangolin that looks astonishingly like a South American anteater. — 2018
2. •
   Lacking anything to give a sense of scale; not having a reference for size.
3. •
   Without using a set of scales.
4. •
   Of a surface: free from deposits of scale.