Synonyms of impermeable
- 1 Syllable
- firm, firms
- 2 Syllables
- firmest, leak-proof, proofer, airtight, rainproof, compact, dense, firmer, sealed
- 3 Syllables
- impervious, waterproof, watertight, appressed, fine-grained, nonporous, hermetic, compacting, padlocked
- 4 Syllables
- imperviable, unpierceable, close-grained, impassable
- 5 Syllables
- incompressible, water-resistant, impenetrable