unpermeable

English

Etymology

From un- +‎ permeable.

Adjective

unpermeable (comparative more unpermeable, superlative most unpermeable)

1. impermeable
   • 1931, West Virginia Academy of Science, Proceedings, volumes 5-8, page 90:

     The Vorce cell is of the permeable class and the Hargreaves-Bird of the unpermeable.