Thesaurus
impregnable
adjective
Synonyms and Antonyms of IMPREGNABLE
1
incapable of being defeated, overcome, or subdued <an impregnable fortress that had foiled one invader after another over the centuries>
Synonyms bulletproof, impregnable, indomitable, insuperable, insurmountable, invulnerable, unbeatable, unconquerable, unstoppable
Related Words inviolable, unassailable, unbreachable, untouchable; armored, defended, guarded, protected, safe, safeguarded, secure, shielded; unbeaten, unbowed, unconquered, undefeated, unsubdued
Near Antonyms exposed, imperiled (or imperilled), insecure, liable, open, susceptible, unguarded, unprotected, unsafe; defenseless, helpless, powerless, weak
2
impossible to get through or into <the castle's supposedly impregnable walls>
Related Words close, compact, dense, thick, tight; compressed, condensed; sturdy, substantial, tough; firm, frozen, hard, solid, stiff; inflexible, rigid, unbending, unyielding
Seen & Heard
What made you want to look up impregnable? Please tell us where you read or heard it (including the quote, if possible).