fastest

Firmly or securely fixed in place; stable.

“That rope is dangerously loose. Make it fast!”

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

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

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

“I am going to buy a fast car.”

Causing unusual rapidity of play or action.

“a fast billiard table”

(of a piece of hardware) Able to transfer data in a short period of time.

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.

“All the washing has come out pink. That red tee-shirt was not fast.”

Tenacious; retentive.

Having an extravagant lifestyle or immoral habits.

“a fast woman”

Ahead of the correct time or schedule.

“There must be something wrong with the hall clock. It is always fast.”

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

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

“Hold this rope as fast as you can.”

(of sleeping) Deeply or soundly .

“He is fast asleep.”

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

“Fast by the sturdy batsman the ball unheeded sped. / That ain't my style, said Casey. Strike one, the umpire said.”

Quickly, with great speed; within a short time .

“Do it as fast as you can.”

Ahead of the correct time or schedule.

“I think my watch is running fast.”

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.

“Muslims fast during Ramadan and Catholics during Lent.”