certainty

As an adjective imminent

is about to happen, occur, or take place very soon, especially of something which won't last long.

As a noun certainty is

the state of being certain.

As nouns the difference between accuracy and certainty

is that accuracy is the state of being accurate; freedom from mistakes, this exemption arising from carefulness; exactness; nicety; correctness while certainty is the state of being certain.

Compactness is a related term of certainty.

As nouns the difference between compactness and certainty

is that compactness is the state of being compact while certainty is the state of being certain.

As nouns the difference between tentative and certainty

is that tentative is a trial; an experiment while certainty is the state of being certain.

As an adjective tentative

is of or pertaining to a trial or trials; essaying; experimental.

Soundness is a related term of certainty.

As nouns the difference between soundness and certainty

is that soundness is (uncountable) the state or quality of being sound while certainty is the state of being certain.

As nouns the difference between doubt and certainty

is that doubt is uncertainty, disbelief while certainty is the state of being certain.

As a verb doubt

is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As an adjective inconvertible

is not convertible.

As a noun certainty is

the state of being certain.

Strength is a related term of certainty.

As nouns the difference between strength and certainty

is that strength is the quality or degree of being strong while certainty is the state of being certain.

As a verb strength

is (obsolete) to give strength to; to strengthen.

Hardness is a related term of certainty.

As nouns the difference between hardness and certainty

is that hardness is the quality of being hard while certainty is the state of being certain.

As nouns the difference between absolute and certainty

is that absolute is that which is independent of context-dependent interpretation, inviolate, fundamental while certainty is the state of being certain.

As an adjective absolute

is absolved; free.