| impervious(adjective, unyielding, unbending, unable, unreceptive) |
| impenetrable(unaffected, unyielding, unbending, resistant, unreceptive) |
| impermeable(unaffected, unyielding, unbending, resistant, unreceptive) |
| punctureproof |
| closed to(expression, unaffected, unyielding, unbending, resistant) |
| hermetic(unaffected, unyielding, unbending, resistant, unreceptive) |
| immune(unaffected, unyielding, unbending, resistant, unreceptive) |
| impassable(unaffected, unyielding, unbending, resistant, unreceptive) |
| impassive(unaffected, unyielding, unbending, resistant, unreceptive) |
| imperviable(unaffected, unyielding, unbending, resistant, unreceptive) |
| inaccessible(unaffected, unyielding, unbending, resistant, unreceptive) |
| invulnerable(unaffected, unyielding, unbending, resistant, unreceptive) |
| obdurate(unyielding, unbending, unreceptive) |
| resistant(unaffected, unyielding, unbending, unreceptive) |
| rigid(unyielding, unbending, unreceptive) |
| sealed(unaffected, unyielding, unbending, resistant, unreceptive) |
| tight(unaffected, unyielding, unbending, resistant, unreceptive) |
| unaffected(unyielding, unbending, resistant, unreceptive) |
| unapproachable(unaffected, unyielding, unbending, resistant, unreceptive) |
| unbending(unyielding, unreceptive) |