Synonyms and Antonyms of fastness
a high rate of movement or performance
- The amazing fastness with which the boy took his shower had us wondering if he'd used any water.
celerity, fleetness, haste, hurry, quickness, rapidity, rapidness, speed, speediness, swiftness, velocity
clip, gait, pace, rate, tempo
acceleration, hastiness, precipitation, precipitousness, rush
alacrity, dispatch, expedition, expeditiousness, promptitude, promptness
a structure or place from which one can resist attack
- The guerillas retreated to their network of hidden fastnesses deep within the mountains.
adherence to something to which one is bound by a pledge or duty
- His uncompromising fastness to the cause of freedom was beyond question.
adhesion, allegiance, attachment, commitment, constancy, dedication, devotedness, devotion, faith, faithfulness, fealty, fidelity, loyalty, piety, steadfastness, troth