Student Thesaurus

One entry found for fastness.
Entry Word: fastness
Function: noun
Text: 1 a high rate of movement or performance <the fastness with which the boy took his shower had us wondering if he'd used any water> -- see SPEED
2 a structure or place from which one can resist attack <the guerillas retreated to their network of hidden fastnesses deep within the mountains> -- see FORT
3 adherence to something to which one is bound by a pledge or duty <his fastness to the cause of freedom was beyond question> -- see FIDELITY