fast

As a noun feet

is (foot).

As a verb fast is

.

Fast is a related term of unshakable.

As a verb fast

is .

As an adjective unshakable is

that cannot be shaken or moved; unfaltering or unwavering.

Vigorous is a related term of fast.

As an adjective vigorous

is physically strong and active.

As a verb fast is

.

Energetic is a related term of fast.

As an adjective energetic

is possessing, exerting, or displaying energy.

As a verb fast is

.

Fast is a related term of buoyant.

As a verb fast

is .

As an adjective buoyant is

having buoyancy; able to float.

As adjectives the difference between fast and immoral

is that fast is firmly or securely fixed in place; stable while immoral is not moral; inconsistent with rectitude, purity, or good morals; contrary to conscience or the divine law.

As an adverb fast

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

As a noun fast

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

As an interjection fast

is short for "stand fast", a warning not to pass between the arrow and the target.

As a verb fast

is to abstain from food, or eat very little, especially for religious or medical reasons.

In lang=en terms the difference between fast and solid

is that fast is firmly or securely fixed in place; stable while solid is having all the geometrical dimensions; cubic.

As an interjection fast

is short for "stand fast", a warning not to pass between the arrow and the target.

As a verb fast

is to abstain from food, or eat very little, especially for religious or medical reasons.

As an acronym SOLID is

acronym of Single responsibility Open-closed, Liskov substitution, Interface segregation and Dependency inversion|lang=en When followed, the created system will be more likely easy to maintain, and extend over time.

Fast is a related term of spry.

As a verb fast

is .

As an adjective spry is

having great power of leaping or running; nimble; active.

Racy is a synonym of fast.

As an adjective racy

is having a strong flavor indicating origin; of distinct characteristic taste; tasting of the soil; hence, fresh; rich.

As a verb fast is

.

As adjectives the difference between fast and unfading

is that fast is firmly or securely fixed in place; stable while unfading is not losing color or value.

As an adverb fast

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

As a noun fast

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

As an interjection fast

is short for "stand fast", a warning not to pass between the arrow and the target.

As a verb fast

is to abstain from food, or eat very little, especially for religious or medical reasons.