- fastness⇄fastness (1), noun.
1. a strong, safe place; stronghold.
Ex. The bandits hid in their mountain fastness.
(SYN) refuge.
2. a being fast or firm; firmness. - fastness⇄fastness (2), noun.
1. the fact or condition of being quick or rapid; swiftness.
2. the fact or condition of being fast in behavior or way of life.