a, b, e, g, l, n, p, m, r, t, i, y are letters that make 'impregnability'
AB, ab, IT, re, PR, MP, nab, lit, il, li, ability, IL, Re, imp, Bi, Li, Pr, Na, Ab are words within 'impregnability'
1 possible definitions for 'impregnability'
Under this definition, impregnability is a noun and has the following properties:
invulnerability has the same meaning as impregnability
'impregnability' can be a type of safety.
strong, unattackable, secure, inviolable, impregnable, unassailable are derivatives of 'impregnability'.