fastness

noun

1. (countable, uncountable)The quality or state of being fast (in various senses).

   “[T]he thing, as it is, having firſt taken vp her ſtand in the memory, and there by the way of knowledge and witting, imprinted it-ſelfe, it were hard it ſhould not repreſent it ſelfe to the imagination, diſplacing and ſupplanting falſehood, which therein can have no ſuch footing, or ſetled faſtneſſe: […]”

   “[T]his is the ſure, infallible Teſt of Love, that the Meaſure of its Strength is to be taken by the Faſtneſs of its Hold.”

2. (countable, specifically, uncountable)The quality or state of being fast (in various senses).

   “Although aniline dyes have replaced most natural dyes in the modern era, natural dyers still revere cochineal for its brilliance and fastness.”

3. (countable, uncountable)The quality or state of being fast (in various senses).

   “[Frog:] Why are all of us fleein'? What dire peril threatens our sylvan fastness? [Bug:] Just run! Your fastness shouldn't be too slow.”

4. (countable, uncountable)The quality or state of being fast (in various senses).
5. (archaic, countable, uncountable)The quality or state of being fast (in various senses).

   “But now his cruelty ſo ſore ſhe drad, / That to thoſe fennes for faſtneſſe ſhe did fly, / And there her ſelfe did hyde from his hard tyranny.”

   “The Foes had left the faſtneſs of their Place, / Prevail'd in Fight, and had his Men in Chace.”

6. (countable, obsolete, uncountable)The quality or state of being fast (in various senses).

   “Which was brought to paſſe I beleue, […] by a good way of Epitome, in binding him ſelfe to tranſlate meros Atticos Oratores, and ſo to bring his ſtyle, from all lowſe groſneſſe, to ſoch firme faſtnes in latin, as is in Demoſthenes in Greeke.”

7. (also, countable, figuratively, uncountable)Something that is fast, or that causes someone or something to be fast (in various senses).

   “[I]f the VVelſh compelled by famine ventred out of their ſtrengthes or faſtneſſes, in or about Snovvdon, the Garriſon Souldiers of Gannocke vvere ready to intercept and kill them; […]”

   “[T]he ſlaves that yet remained in the faſtneſſes of Jamaica, attached to the Spaniſh, and hoſtile to the Engliſh ſettlers, continued to be troubleſome, and at times formidable.”

   “The incubators are built in remote fastnesses, where there is little or no likelihood of their being discovered by other tribes.”

   “When she came to know writers it was like adventuring upon a stage which till then she had known only from the other side of the footlights. She saw them dramatically, and really seemed herself to live a larger life because she entertained them and visited them in their fastnesses.”

   “[…] though cut glass was nothing new in the nineties, it was then especially busy reflecting the dazzling light of fashion from the Back Bay to the fastnesses of the Middle West.”

8. (countable, regional, uncountable)Something that is fast, or that causes someone or something to be fast (in various senses).