1. fastness

noun. (ˈfæstnəs) The quality of being fixed in place as by some firm attachment.
Synonyms
fixedness immovability immovableness lodgement lodgment secureness fixture fixity lodging
Antonyms
movability looseness movableness interesting smart

2. fastness

noun. (ˈfæstnəs) A rate (usually rapid) at which something happens.
Synonyms
slow precipitation hurriedness rate fast gradualness hastiness execution speed hurry swiftness speed graduality haste pace
Antonyms
slow fast strengthen quickly active

3. fastness

noun. (ˈfæstnəs) A strongly fortified defensive structure.
Synonyms
stronghold hold defensive structure citadel blockhouse dungeon bastion redoubt keep donjon defence defense
Antonyms
sudden hurried accelerate increase rush
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