eternity

As a noun eternity

is (uncountable) existence without end, infinite time.

As an adverb permanently is

in a permanent manner; lastingly.

As nouns the difference between immutable and eternity

is that immutable is something that cannot be changed while eternity is (uncountable) existence without end, infinite time.

As an adjective immutable

is unable to be changed without exception.

As nouns the difference between mission and eternity

is that mission is mission (all senses) while eternity is (uncountable) existence without end, infinite time.

As a noun eternity

is (uncountable) existence without end, infinite time.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between eternity and instant

is that eternity is (uncountable) existence without end, infinite time while instant is a very short period of time; a moment.

As an adjective instant is

(dated) impending; imminent.

As an adverb instant is

(poetic) at once; immediately.

As a noun eternity

is (uncountable) existence without end, infinite time.

As a proper noun limbo is

abbreviation of limburger, an inhabitant of limburg, a part of the low countries.

As a noun eternity

is (uncountable) existence without end, infinite time.

As a proper noun hell is

.

As a noun eternity

is (uncountable) existence without end, infinite time.

As an adjective undefined is

lacking a definition or value.

As an adjective endless

is having no end.

As a noun eternity is

(uncountable) existence without end, infinite time.

As nouns the difference between foreverness and eternity

is that foreverness is the quality of being forever, of never coming to an end while eternity is (uncountable) existence without end, infinite time.