fastness

1 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 Synonyms of fastness celerity, speed, fleetness, haste, hurry, quickness, rapidity, rapidness, speediness, swiftness, velocityWords Related to fastness clip, gait, pace, rate, tempo; drive, hustle; acceleration, hastiness, precipitation, precipitousness, rush; alacrity, dispatch, expedition, expeditiousness, promptitude, promptness; warp speedNear Antonyms of fastness languidness, languor, leisureliness, lethargy, torpidity, torpor; reluctance; deliberateness, deliberation; dilatoriness, lateness, pokiness, procrastinationAntonyms of fastness slowness, sluggishness

2 a structure or place from which one can resist attack the guerillas retreated to their network of hidden fastnesses deep within the mountains Synonyms of fastness bastion, castle, citadel, fort, fortification, fortress, hold, redoubt, strongholdWords Related to fastness battlement, breastwork, bulwark, earthwork, embattlement, parapet, rampart; bunker, dugout; blockhouse, garrison house; alcazar, casbah (also kasbah)

3 adherence to something to which one is bound by a pledge or duty his uncompromising fastness to the cause of freedom was beyond question Synonyms of fastness adhesion, allegiance, attachment, commitment, constancy, dedication, devotedness, devotion, faith, faithfulness, fidelity, fealty, loyalty, piety, steadfastness, trothWords Related to fastness affection, fondness; determination, firmness, resolution; dependability, reliability, trustability, trustiness, trustworthinessNear Antonyms of fastness alienation, disaffection, estrangement, separationAntonyms of fastness disloyalty, faithlessness, falseness, falsity, inconstancy, infidelity, perfidiousness, perfidy, treachery, unfaithfulness