impregnably

In unbreakable fashion

In a way that cannot be overcome, breached, or successfully attacked.

A fortress is impregnably defended when no assault can take it.

The word extends to arguments, positions, or reputations: Her logic was impregnably sound.

The champion seemed impregnably ahead until the final round.

invulnerable

indestructible

Impossible to damage permanently

unconquerable · unassailable · insurmountable · bulletproof · ironclad · adamantine · impenetrable · unyielding · indomitable · insuperable

fortified

fortress

Heavily defended military structure

bastion · rampart · bulwark · battlements · moat · garrison · redoubt · keep · palisade · barbican

logical

irrefutable

Impossible to disprove

unassailable · foolproof · flawless · soundly · conclusively · indisputably · undeniably · bulletproof · ironclad · rigorously

secure

protected

Kept from harm

locked · encrypted · sealed · vaulted · barricaded · inaccessible · unreachable · untouchable · sanctuary · refuge

Opposites
defensibility/vulnerability

impregnablyvulnerably

Without defense or shield

defenselessly · weakly · insecurely · precariously · shakily

Family

impregnable, impregnability

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G