impregnable
Not pregnable; not to be taken or reduced by force: as, an impregnable fortress.
Not to be moved, shaken, or overcome; invincible: as, impregnable virtue.
adjectiveNot to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable
adjectiveCapable of being impregnated, as the egg of an animal, or the ovule of a plant.
adjectiveToo strong to be
Capable of being
incapable of being overcome, challenged or refuted
adjectiveimmune to attack; incapable of being tampered with
adjectivecapable of conceiving