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

impregnable was our Word of the Day on 09/01/2014. Hear the podcast!

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a brief usually trivial fact

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