certain

As a noun thesis

is a statement supported by arguments.

As an adjective certain is

certain.

As an adjective certain

is sure, positive, not doubting.

As a determiner certain

is having been determined but unspecified. The quality of some particular subject or object which is known by the speaker to have been specifically singled out among similar entities of its class.

As a noun finality is

the state of "being final"; the condition from which no further changes occur.

As an adverb possibly

is (modifying a clause or predicate).

As an adjective certain is

certain.

As adjectives the difference between improbable and certain

is that improbable is not likely to be true while certain is certain.

As adjectives the difference between certain and unique

is that certain is certain while unique is (not comparable) being the only one of its kind; unequaled, unparalleled or unmatched.

As a noun unique is

a thing without a like; something unequalled or unparallelled.

As adjectives the difference between credible and certain

is that credible is credible while certain is certain.

As adjectives the difference between reasonable and certain

is that reasonable is having the faculty of reason; endued with reason; rational while certain is certain.

As a noun potential

is .

As an adjective certain is

certain.

As adjectives the difference between certain and defiant

is that certain is sure, positive, not doubting while defiant is defying.

As a determiner certain

is having been determined but unspecified. The quality of some particular subject or object which is known by the speaker to have been specifically singled out among similar entities of its class.

As adjectives the difference between certain and defined

is that certain is certain while defined is having a definition or value.

As a verb defined is

(define).