fastness.
The quality or state of being fast (in various senses).
Meaning & usage
The quality or state of being fast (in various senses). The quality or state of being strongly attached; firmness, secureness, tenacity.
The quality or state of being fast (in various senses). The quality or state of being strongly attached; firmness, secureness, tenacity. The ability of a dye to withstand fading.
The quality or state of being fast (in various senses). The quality or state of moving quickly; quickness, rapidity, swiftness.
The quality or state of being fast (in various senses). The quality or state of having an extravagant lifestyle or immoral habits.
The quality or state of being fast (in various senses). Of a fortress or other place: the quality or state of being secure from access or attack; safety, security.
The quality or state of being fast (in various senses). The quality or state of being firm, hard, or solid; firmness, hardness, solidity.
Something that is fast, or that causes someone or something to be fast (in various senses). A fortified or secure place; a fortress, a stronghold.
Something that is fast, or that causes someone or something to be fast (in various senses). Something used to fasten or tie; a fastener or fastening.
Where this word comes from
From Middle English fastnes, fastnesse (“immovableness, stability; firmness, solidness; secure attachment; constancy; obstinacy; something giving firmness or strength; of sleep: soundness; of a wound: healing; assurance, confirmation”) [and other forms], from Old English fæstnes (“fastness, firmness, stability; resolution; tenacity; vigour; firmament; fortification”) [and other forms], from fæst (“firm, stable; constant”) (from Proto-Germanic *fastuz (“firm, fixed; secure”); see further at that entry) + -nes (suffix forming abstract nouns denoting a quality or state). The English word may be analysed as fast + -ness.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.