Thesaurus

impregnable

adjective

Synonyms and Antonyms of impregnable

  1. 1 incapable of being defeated, overcome, or subdued <an impregnable fortress that had foiled one invader after another over the centuries> Synonyms bulletproof, invincible, indomitable, insuperable, insurmountable, invulnerable, unbeatable, unconquerable, unstoppableRelated Words inviolable, unassailable, unbreachable, untouchable; armored, defended, guarded, protected, safe, safeguarded, secure, shielded; unbeaten, unbowed, unconquered, undefeated, unsubduedNear Antonyms exposed, imperiled (or imperilled), insecure, liable, open, susceptible, unguarded, unprotected, unsafe; defenseless, helpless, powerless, weakAntonyms superable, surmountable, vincible, vulnerable

  2. 2 impossible to get through or into <the castle's supposedly impregnable walls> Synonyms impassable (also impassible), impermeable, impervious, impenetrableRelated Words close, compact, dense, thick, tight; compressed, condensed; sturdy, substantial, tough; firm, frozen, hard, solid, stiff; inflexible, rigid, unbending, unyieldingNear Antonyms soft, squishy; bendable, elastic, flexible, giving, malleable, pliable, yielding; absorbent, porousAntonyms negotiable, passable, penetrable, permeable



Seen and Heard

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

WORD OF THE DAY

an alert or lookout

Get Word of the Day daily email!