fastness Synonyms

fixedness secureness speed fixture fixity stronghold swiftness beachhead speediness fasthold soundness solidity security base complex sconce robustness resistance refuge redoubt stability stableness tower safe house substantiality sturdiness safehold strength steerageway casbah safe harbor steadfastness stanchness rapidness rapidity acropolis firmness embattlement donjon defense constancy citadel chateau celerity castle blockhouse bastion barracoon fort fortification quickness