# fastly

> English word · Adverb

## Definitions
1. In a secure or firm manner; securely

## Etymology
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
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/fastly