IPA: /ˈkwɪkli/
KK: /ˈkwɪkli/
In a fast manner; done with speed.
She finished her homework quickly so she could go out to play.
Quickly → It is formed from "quick" (from Old English "cwic", meaning alive or living) and the suffix "-ly" (meaning in a manner of). The word "quickly" means in a manner that is alive or lively, suggesting speed.
Think of 'alive' ('cwic') to remember that 'quickly' means to do something in a lively or fast manner.