impregnable

From Wiktionary

Pronunciation[change]

Adjective[change]

Positive
impregnable

Comparative
more impregnable

Superlative
most impregnable

  1. When something is impregnable, it cannot be beaten. Used in contexts of physical force, but in metaphor, for any situation where a position or person cannot be defeated.
    The Welsh found that Edward's castles were impregnable.
    The Macedonian phalanx was impregnable from the front.
    The grandmaster's position was quite impregnable.