Quick
Part of speech: adverb
Definition: quickly
Part of speech: noun
Definition: raw or sensitive flesh, especially that underneath finger and toe nails.
Part of speech: adjective
Definition: Moving with speed, rapidity or swiftness, or capable of doing so; rapid; fast. Occuring in a short time; happening or done rapidly. Lively, fast-thinking, witty, intelligent. Mentally agile, alert, perceptive. Of temper: easily aroused to anger; quick-tempered. 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.
Example sentence: Sad people dislike the happy, and the happy the sad; the quick thinking the sedate, and the careless the busy and industrious.
Fast
Part of speech: verb
Definition: To abstain from or eat very little food; to abstain from food for religious reasons.
Part of speech: noun
Definition: The act or practice of abstaining from food or of eating very little food.The period of time during which one abstains from or eats very little food.A train that calls at only some stations it passes between its origin and destination, typically just the principal stations.
Part of speech: adverb
Definition: In a firm or secure manner, securely; in such a way as not to be moved.Deeply or soundly.Immediately following in place or time; close, very near.Quickly, with great speed; within a short time.Ahead of the correct time or schedule.
Part of speech: adjective
Definition: Firmly or securely fixed in place; stable.Of people: steadfast, with unwavering feeling. (Now only in set phrases like "fast friend".)Moving with great speed, or capable of doing so; swift, rapid.Deep or sound (of sleep); fast asleep (of people).Of dyes or colours: not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.Having an extravagent lifestyle or immoral habits.Ahead of the correct time or schedule.More sensitive to light than average.
Part of speech: interjection
Definition: Short for "stand fast", a warning not to pass between the arrow and the target.
Example sentence: I call Alibaba '1,001 mistakes.' We expanded too fast, and then in the dot-com bubble, we had to have layoffs. By 2002, we had only enough cash to survive for 18 months. We had a lot of free members using our site, and we didn't know how we'd make money. So we developed a product for China exporters to meet U.S. buyers online. This model saved us.