quick

Raw or sensitive flesh, especially that underneath finger and toe nails.

Plants used in making a quickset hedge

The life; the mortal point; a vital part; a part susceptible to serious injury or keen feeling.

To amalgamate surfaces prior to gilding or silvering by dipping them into a solution of mercury in nitric acid.

To quicken.

Moving with speed, rapidity or swiftness, or capable of doing so; rapid; fast.

"He's a quick runner."

Occurring in a short time; happening or done rapidly.

"That was a quick meal."

Lively, fast-thinking, witty, intelligent.

"You have to be very quick to be able to compete in ad-lib theatrics."

Quickly, in a quick manner.

"Come here, quick!"