prompt or immediate in response; done without delay
He was quick to apologize.
mentally sharp, alert, or perceptive
She has a quick mind.
quickadjective
Moving fast or doing something in a short time.
She made a quick decision to leave the party early.
Prompt to understand, think, or learn; intelligent.
He is quick to grasp new concepts in mathematics.
Occurring with little or no delay.
The quick response from the emergency services saved lives.
Alive; living (now chiefly in idioms or archaic usage).
The phrase "the quick and the dead" contrasts those who are alive with those who have passed away.
Pregnant and able to feel fetal movement; in the stage of pregnancy when the fetus is felt to stir (archaic, chiefly in the phrase "quick with child").
In many old statutes, a woman who was quick with child could not be executed.
quickadverb
Quickly; at a rapid pace or without delay (informal).