Firmly or securely fixed in place; stable.
Firm against attack; fortified by nature or art; impregnable; strong.
Steadfast, with unwavering feeling. (Now mostly in set phrases like fast friend(s).)
Moving with great speed, or capable of doing so; swift, rapid.
Moving with great speed, or capable of doing so; swift, rapid.
Of a place, characterised by business, hustle and bustle, etc.
Causing unusual rapidity of play or action.
Able to transfer data in a short period of time.
Deep or sound (of sleep); fast asleep (of people).
Not running or fading when subjected to detrimental conditions such as wetness or intense light; permanent.
(obsolete) Tenacious; retentive.
Having an extravagant lifestyle or immoral habits.
Ahead of the correct time or schedule.
More sensitive to light than average.

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

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

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

To practice religious abstinence, especially from food.
To reduce or limit one's nutrition intake for medical or health reasons, to diet.
(academic) To cause a person or animal to abstain, especially from eating.