Forever and Once

Opposite meaning words

Forever adverb - For all time.

Usage example: we'll be best friends forever

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Once is an antonym for forever.

Once adverb - At an earlier or previous time.

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Forever is an antonym for once.

And the penalty for losing the Tourney would have been—once again—having to leave Proton forever.

Source: Inevitable Tournament
The blackened area where a building once stood stays around forever unless built on.

Source: Video Game / Empire Earth
Hell was once ruled with an iron claw by its undead ruler, King Hare, but even in Hell no one lives forever.

Source: Video Game / Hell Yeah! Wrath of the Dead Rabbit

Cite this Source

Once and Forever. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/forever/once

Forever & Once. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/forever/once>.

Once or Forever. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/forever/once.

Google Ngram Viewer shows how "forever" and "once" have occurred on timeline