Synonyms of eternal in English:

eternal


See US English definition of eternal

See UK English definition of eternal

See Spanish definition of eterno

adjective

1‘the hope of eternal happiness’

SYNONYMS
everlasting, never-ending, endless, without end, perpetual, undying, immortal, deathless, indestructible, imperishable, immutable, abiding, permanent, enduring, infinite, boundless, timeless
rare sempiternal, perdurable
ANTONYMS

transient

2‘the price of freedom is eternal vigilance’

SYNONYMS
constant, continual, continuous, perpetual, persistent, sustained, unremitting, relentless, unrelenting, unrelieved, uninterrupted, unbroken, unabating, interminable, never-ending, non-stop, round-the-clock, always-on, incessant, endless, ceaseless
ANTONYMS

intermittent