impenetrable


impenetrable

adjective

Definition of IMPENETRABLE

1
impossible to get through or into <the ancient temple was surrounded by vast stretches of impenetrable jungle>
Synonyms impassable (also impassible), impermeable, impervious, impregnable
4
not allowing penetration (as by gas, liquid, or light) <the container of toxic waste has an impenetrable seal to prevent leaks>
Near Antonyms absorbent, leaky, porous, unsealed

Seen & Heard

What made you want to look up impenetrable? Please tell us where you read or heard it (including the quote, if possible).