1. fastness - Noun
2. fastness - Adjective
The state of being fast and firm; firmness; fixedness; security; faithfulness.
A fast place; a stronghold; a fortress or fort; a secure retreat; a castle; as, the enemy retired to their fastnesses in the mountains.
Conciseness of style.
The state of being fast or swift.
Source: Webster's dictionarythe project advanced with gratifying speed Source: Internet
DPP Orange TR ECO07101 by Hangzhou Epsilon Chemical is diketopyrrolopyrrole orange pigment with bright color and excellent fastness. Source: Internet
Colortrend® 808-1810 by Chromaflo Technologies is a yellow colored high performance low-VOC and APE-free universal colorant based on iron oxide (57%) pigment with excellent light fastness. Source: Internet
Has good light fastness of pigment. Source: Internet
He must have felt at home in the mountain fastness of western North Carolina. Source: Internet
Is a green shade, very opaque benzimidazolone pigment with excellent light, weather and solvent fastness properties as well as high heat stability. Source: Internet