Eternal
/ɪˈtɜːnəl/
noun
One who lives forever; an immortal.
adjective
Lasting forever; unending.
Existing outside time; as opposed to sempiternal, existing within time but everlastingly
Exceedingly great or bad; used as an intensifier.
“some eternal villain”
Synonyms: agelong, endless, everlasting, permanent, sempiternal, unending, atemporal, timeless