impregnable

impregnable

adjective

Definition 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

Antonyms superable, surmountable, vincible, vulnerable

2

impossible to get through or into <the castle's supposedly impregnable walls>

Synonyms impassable (also impassible), impermeable, impervious, impregnable

Related Words close, compact, dense, thick, tight; compressed, condensed; sturdy, substantial, tough; firm, frozen, hard, solid, stiff; inflexible, rigid, unbending, unyielding

Near Antonyms soft, squishy; bendable, elastic, flexible, giving, malleable, pliable, yielding; absorbent, porous

Antonyms negotiable, passable, penetrable, permeable