fast·ness 
(făstnĭs)
(făstnĭs)n.
1. The condition or quality of being fast, especially:
a. Firmness; security.
b. Rapidity; swiftness.
2. The quality or condition of color retention; colorfastness.
3.
a. A secure or fortified place; a stronghold.
b. A remote, secret place.