impervious

/ˌɪmpˈɝviəs/ · 4 syllables

Meaning

adjective

1. not admitting of passage or capable of being affected
   “a material impervious to water”

Synonyms for impervious

• imperviable
• fast
• acid-fast
• colorfast
• greaseproof
• mothproof
• proof
• resistant
• corrosion-resistant
• rot-resistant
• runproof
• soundproof

Antonyms of impervious

• pervious