fastness

/fˈæstnəs/ · 2 syllables

Meaning

noun

1. a rate (usually rapid) at which something happens
   “the project advanced with gratifying speed”
2. the quality of being fixed in place as by some firm attachment
3. a strongly fortified defensive structure

Synonyms for fastness

• speed
• swiftness
• fixedness
• fixity
• fixture
• secureness
• stronghold

Words that rhyme with fastness

• steadfastness
• vastness
• lightfastness