1. Impermeableness.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• imperfecability,
• imperfectbility,
• impeirshability,
• umpermeability,
• jmpermeability,
• kmpermeability,
• ompermeability,
• 9mpermeability,
• 8mpermeability,
• inpermeability,
• ikpermeability,
• ijpermeability,
• impereability,
• impermability,
• impermeabillity,
• impurmeability,
• imparmeability,
• impermeabality,
• imperdeibility,
• impereviability

• imperturbableness,
• imperialist,
• improbability,
• impermissible,
• impregnability,
• impermissibility,
• impermissibly,
• imperturbability,
• imperceptibility,
• imperishable,
• imperatively,
• impracticability,
• imperfectibility,
• imperturbable,
• impermeableness,
• imperfectability,
• imperishability,
• impermeable.

The adjective form of the word "impermeability" is "impermeable".

The plural of the "impermeability" can be the "impermeabilities".

The singular of the "impermeability" can be the "impermeability".