Rapid vs. Fast

Rapidadjective

Very swift or quick.

Rapidadjective

Steep, changing altitude quickly. (of a slope)

Rapidadjective

Needing only a brief exposure time. (of a lens, plate, film, etc.)

Rapidadjective

Violent, severe.

Rapidadjective

Happy.

Rapidadverb

(archaic or colloquial) Rapidly.

Rapidnoun

a rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water.

Rapidnoun

(dated) A burst of rapid fire.

Rapidadjective

Very swift or quick; moving with celerity; fast; as, a rapid stream; a rapid flight; a rapid motion.

Rapidadjective

Advancing with haste or speed; speedy in progression; in quick sequence; as, rapid growth; rapid improvement; rapid recurrence; rapid succession.

Rapidadjective

Quick in execution; as, a rapid penman.

Rapidnoun

The part of a river where the current moves with great swiftness, but without actual waterfall or cascade; sometimes called whitewater; - usually used in the plural; as, the Lachine rapids in the St. Lawrence.

Rapidnoun

a part of a river where the current is very fast

Rapidadjective

done or occurring in a brief period of time;

Rapidadjective

characterized by speed; moving with or capable of moving with high speed;

Fastadjective

(dated) Firmly or securely fixed in place; stable.

Fastadjective

Firm against attack; fortified by nature or art; impregnable; strong.

Fastadjective

(of people) Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).)

Fastadjective

Moving with great speed, or capable of doing so; swift, rapid.

Fastadjective

Causing unusual rapidity of play or action.

Fastadjective

Able to transfer data in a short period of time.

Fastadjective

Deep or sound (of sleep); fast asleep (of people).

Fastadjective

(of dyes or colours) Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.

Fastadjective

(obsolete) Tenacious; retentive.

Fastadjective

(dated) Having an extravagant lifestyle or immoral habits.

Fastadjective

Ahead of the correct time or schedule.

Fastadjective

(of photographic film) More sensitive to light than average.

Fastadverb

In a firm or secure manner, securely; in such a way as not to be moved; safe, sound .

Fastadverb

(of sleeping) Deeply or soundly .

Fastadverb

Immediately following in place or time; close, very near .

Fastadverb

Quickly, with great speed; within a short time .

Fastadverb

Ahead of the correct time or schedule.

Fastnoun

A train that calls at only some stations it passes between its origin and destination, typically just the principal stations

Fastnoun

The act or practice of abstaining from food or of eating very little food.

Fastnoun

The period of time during which one abstains from or eats very little food.

Fastinterjection

(archery) Short for "stand fast", a warning not to pass between the arrow and the target

Fastverb

(intransitive) To restrict one’s personal consumption, generally of food, but sometimes other things, in various manners (totally, temporally, by avoiding particular items), often for religious or medical reasons.

Fastverb

To abstain from food; to omit to take nourishment in whole or in part; to go hungry.

Fastverb

To practice abstinence as a religious exercise or duty; to abstain from food voluntarily for a time, for the mortification of the body or appetites, or as a token of grief, or humiliation and penitence.

Fastnoun

Abstinence from food; omission to take nourishment.

Fastnoun

Voluntary abstinence from food, for a space of time, as a spiritual discipline, or as a token of religious humiliation.

Fastnoun

A time of fasting, whether a day, week, or longer time; a period of abstinence from food or certain kinds of food; as, an annual fast.

Fastnoun

That which fastens or holds; especially, (Naut.) a mooring rope, hawser, or chain; - called, according to its position, a bow, head, quarter, breast, or stern fast; also, a post on a pier around which hawsers are passed in mooring.

Fastadjective

Firmly fixed; closely adhering; made firm; not loose, unstable, or easily moved; immovable; as, to make fast the door.

Fastadjective

Firm against attack; fortified by nature or art; impregnable; strong.

Fastadjective

Firm in adherence; steadfast; not easily separated or alienated; faithful; as, a fast friend.

Fastadjective

Permanent; not liable to fade by exposure to air or by washing; durable; lasting; as, fast colors.

Fastadjective

Tenacious; retentive.

Fastadjective

Not easily disturbed or broken; deep; sound.

Fastadjective

Moving rapidly; quick in mition; rapid; swift; as, a fast horse.

Fastadjective

Given to pleasure seeking; disregardful of restraint; reckless; wild; dissipated; dissolute; as, a fast man; a fast liver.

Fastadjective

In such a condition, as to resilience, etc., as to make possible unusual rapidity of play or action; as, a fast racket, or tennis court; a fast track; a fast billiard table, etc.

Fastadverb

In a fast, fixed, or firmly established manner; fixedly; firmly; immovably.

Fastadverb

In a fast or rapid manner; quickly; swiftly; extravagantly; wildly; as, to run fast; to live fast.

Fastnoun

abstaining from food

Fastverb

abstain from certain foods, as for religious or medical reasons;

Fastverb

abstain from eating;

Fastadjective

acting or moving or capable of acting or moving quickly;

Fastadjective

(used of timepieces) indicating a time ahead of or later than the correct time;

Fastadjective

at a rapid tempo;

Fastadjective

(of surfaces) conducive to rapid speeds;

Fastadjective

firmly fastened or secured against opening;

Fastadjective

resistant to destruction or fading;

Fastadjective

unrestrained by convention or morality;

Fastadjective

hurried and brief;

Fastadjective

securely fixed in place;

Fastadjective

unwavering in devotion to friend or vow or cause;

Fastadverb

quickly or rapidly (often used as a combining form);

Fastadverb

firmly or tightly;