What is another word for fastness?

Need synonyms for fastness? Here's a list of similar words from our thesaurus that you can use instead.

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.”
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.”
The quality or state of being stable, or firmly established
Shelter or protection from danger
Tenacity or firmness
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