Dictionary and Thesaurus

Definition of Fastness

• (a.) The state of being fast and firm; firmness; fixedness; security; faithfulness.
• (a.) A fast place; a stronghold; a fortress or fort; a secure retreat; a castle; as, the enemy retired to their fastnesses in the mountains.
• (a.) Conciseness of style.
• (a.) The state of being fast or swift.

Synonyms of Fastness

• Speed
• Swiftness
• Fixedness
• Fixity
• Fixture
• Secureness
• Stronghold

Antonyms of Fastness

• Looseness

Homophones of Fastness