eternal

As adjectives the difference between eternal and indestructible

is that eternal is lasting forever; unending while indestructible is not destructible; incapable of decomposition or of being destroyed; invincible.

In philosophy|lang=en terms the difference between eternal and sempiternity

is that eternal is (philosophy) existing outside time; as opposed to sempiternal, existing within time but everlastingly while sempiternity is (philosophy) existence within time but infinitely into the future; as opposed to eternity, understood as existing outside time.

As an adjective eternal

is lasting forever; unending.

As a noun sempiternity is

(philosophy) existence within time but infinitely into the future; as opposed to eternity, understood as existing outside time.

As adjectives the difference between eternal and unchangeable

is that eternal is lasting forever; unending while unchangeable is not changeable; incapable of being changed or of changing; immutable.

As a noun unchangeable is

something that cannot be changed.

As adjectives the difference between eternal and undefined

is that eternal is lasting forever; unending while undefined is lacking a definition or value.

As an adjective eternal

is lasting forever; unending.

As a noun evolution is

evolution.

As a noun impermanence

is want of permanence or continued duration.

As an adjective eternal is

lasting forever; unending.

Eternal is a related term of cosmological.

As adjectives the difference between eternal and cosmological

is that eternal is lasting forever; unending while cosmological is of or pertaining to cosmology, or to the overall structure of the universe.

In lang=en terms the difference between classic and eternal

is that classic is one learned in the literature of Ancient Greece and Ancient Rome; a student of classical literature while eternal is exceedingly great or bad; used as an intensifier.

As adjectives the difference between classic and eternal

is that classic is of or relating to the first class or rank, especially in literature or art while eternal is lasting forever; unending.

As a noun classic

is a perfect and/or early example of a particular style.

Eternal is a related term of firm.

As adjectives the difference between eternal and firm

is that eternal is lasting forever; unending while firm is steadfast, secure, hard (in position).

As a noun firm is

(uk|business) a business partnership; the name under which it trades.

As a verb firm is

to make firm or strong; fix securely.

Eternal is a related term of incorruptible.

As adjectives the difference between eternal and incorruptible

is that eternal is lasting forever; unending while incorruptible is not subject to corruption or decay.

As a noun incorruptible is

(historical) one of an ancient religious sect of alexandria, whose adherents believed that the body of christ was incorruptible, and that he suffered hunger, thirst, and pain only in appearance.