fastness Synonyms

speed fixity fixture secureness fixedness stronghold swiftness resistance refuge security solidity soundness redoubt rapidity robustness base complex fasthold safehold tower sturdiness celerity strength steadfastness stableness stability speediness quickness permanence palace defense constancy citadel chateau castle blockhouse bastion barracoon alcazar donjon embattlement firmness keep immovableness immobility hold haste garrison fortress fortification fort