QUICKEST

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

Example: "He's a quick runner."

Occurring in a short time; happening or done rapidly.

Example: "That was a quick meal."

Lively, fast-thinking, witty, intelligent.

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

Mentally agile, alert, perceptive.

Example: "My father is old but he still has a quick wit."

Of temper: easily aroused to anger; quick-tempered.

Example: "He is wont to be rather quick of temper when tired."

Alive, living.

Pregnant, especially at the stage where the foetus's movements can be felt; figuratively, alive with some emotion or feeling.

Of water: flowing.

Burning, flammable, fiery.

Fresh; bracing; sharp; keen.

(of a vein of ore) productive; not "dead" or barren