| Fastness 1. (n.) The state of being fast and firm; firmness; fixedness; security; faithfulness. 2. (n.) A fast place; a stronghold; a fortress or fort; a secure retreat; a castle; as, the enemy retired to their fastnesses in the mountains. 3. (a.) Conciseness of style. 4. (n.) The state of being fast or swift. Thesaurus Entries bastion, beachhead, blockhouse, bridgehead, bunker, castle, citadel, donjon, fasthold, fastness, fort, fortress, garrison, garrison house, hold, keep, martello, martello tower, mote, motte, peel, peel tower, pillbox, post, rath, safehold, strong point, stronghold, tower, tower of strength, ward |