impregnable
Impossible to breach
Impregnable describes something that cannot be broken into, conquered, or overcome.
A fortress is impregnable if no enemy can breach its walls.
The word extends to anything resistant to attack or challenge: an impregnable argument, an impregnable lead in a competition.
Their defensive line proved impregnable.
Impossible to overcome
- indestructibleImpossible to damage permanently
- invulnerableImmune to all harm
- unconquerableImpossible to defeat
- unassailableImpossible to attack successfully
insurmountable · indomitable · unyielding · bulletproof · ironclad · impervious · untouchable · adamantine
Fortified medieval residence
- citadelFortified urban stronghold
- strongholdFortified place of defense
- bastionFortified defensive position
- keepRetain or fortified tower
rampart · battlements · bulwark · redoubt · palisade · stockade · barbican · parapet
unbeatable
Impossible to overcome
- indestructibleImpossible to damage permanently
- invulnerableImmune to all harm
- unconquerableImpossible to defeat
unassailable · insurmountable · indomitable · unyielding · bulletproof · ironclad · impervious · untouchable · adamantine · insuperable
castle
Fortified medieval residence
- citadelFortified urban stronghold
- strongholdFortified place of defense
- bastionFortified defensive position
keep · rampart · battlements · bulwark · redoubt · palisade · stockade · barbican · parapet · gatehouse
siege
Encirclement forcing surrender
- garrisonStationed military force
- entrenchmentFortified or fixed position
- bunkerReinforced subterranean stronghold
armament · barricade · blockade · perimeter · outpost · fortification · tactics · flanking · artillery · rampart
safe
Free from peril
refuge · sanctuary · asylum · harbor · retreat · shelter · safeguard · vault · strongroom · lockdown
- strength wordsstrong, powerful, mighty, potent, robust
- invincibilityshield, armor, bulletproof, immortality, divine protection
- power wordsunstoppable, unbeatable, almighty, all-powerful, supreme
- contronymscleave, sanction, bolt, dust, fast
impregnableconquerable
Able to be vanquished
vincible · pregnable · defenseless · vulnerable · undefended
impregnablepenetrable
Capable of being pierced
permeable · porous · breachable · passable · open
impregnablevulnerable
Open to attack
exposed · helpless · unprotected · insecure · susceptible