"primeval" in the adjective sense
1. aboriginal, primal, primeval, primaeval, primordial
having existed from the beginning in an earliest or original stage or state
"aboriginal forests"
"primal eras before the appearance of life on earth"
"the forest primeval"
"primordial matter"
"primordial forms of life"
Source: WordNet® (An amazing lexical database of English)
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