adjective
Definition: Something that happens or is done in a short amount of time; fast or speedy.
Example: She took a quick look at the report before the meeting.
adverb
Definition: In a way that is fast or done without delay.
Example: She finished her homework quickly so she could go out to play.
noun
Definition: The sensitive or living part of something, especially flesh, or the essence of a matter.
Example: The doctor carefully examined the quick under her fingernail.