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Eternal

/ɪˈtɜːnəl/

Something that lasts forever or has no end.

Synonyms:

O splendour of the living light eternal!And this is the eternal law.He is an "eternal blood-sucker" of "diabolical purposes,"

Originating in the late Middle English, from Old French eternel, or directly from Latin aeternus meaning without beginning or end, everlasting.

13 mentions per 1 million words

Moderate

Hint: Frequency according to COCA