Synonyms of unpierceable
- 1 Syllable
- tight
- 2 Syllables
- sealed
- 3 Syllables
- immune, impervious, resistant, watertight, unmoved, hermetic
- 4 Syllables
- imperviable, impassive, impassable, impermeable, unaffected
- 5 Syllables
- invulnerable, inaccessible, unapproachable, unreceptive, impenetrable