fastly
adverb
fastly is an adverb meaning “In a secure or firm manner; securely” (English Wiktionary, September 2026). It is spelled F-A-S-T-L-Y, and it appears about once in every 19 million words in written English (wordfreq, 2021 data).
What does fastly mean?
adverb
- 1
In a secure or firm manner; securely
We tied the rope fastly this time; we didn't want it to get away again.
- 2
nonstandardquickly
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of fastly
- more fastly comparative
- most fastly superlative
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is fastly?
Fastly appears about once in every 19 million words in written English, the 130,282nd most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Where does fastly come from?
From Middle English fastly, fastliche, festliche, from Old English fæstlīċe (“firmly, constantly”), from Proto-West Germanic *fastulīkē, from Proto-West Germanic *fastulīkê (“securely, firmly”); equivalent to fast + -ly.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).