corredor rápido
The word fast in spanish is "rápido" or "veloz"
Yo soy un corredor muy rapido.
Fast as flash speedy as lightning
No fastly is not a word. Fast is an adverb so you can say: He ran fast.
Rápido - Veloz - Ligero
Wiki estimates that there are well over 2,000 African lanuages, so the question needs to be more specific than that
Road Runner: Funny and smart and fast Sonic: Fast Answer : Road Runner
runner
A football coach might use a fast runner because if he wants to get a touchdown on the last four second or so the fast runner might make it on time and then they might win.
7.4sec
A Cheetah
corredor