形容詞 primeval:

1. having existed from the beginning; in an earliest or original stage or state
   同義詞：aboriginal, primal, primaeval, primordial

1. The primeval chaos out of which it was believed that the earth and sky were formed.
   混沌，洪荒原始的混沌狀態(tài)，據(jù)信地球和天空由此形成
2. Being first in time; original; primeval.
   最初的，原始的; 遠(yuǎn)古的

pri.me.val

adj.（形容詞）
Belonging to the first or earliest age or ages; original or ancient:
原始的，早期的：屬于最初的或最早的年代的；原先的或遠(yuǎn)古的：
例句：
a primeval forest.
一片原始森林

來源：
From Latin promaevus [early in life]
源自 拉丁語 promaevus [生命的初期]
promus [first] * see per
promus [第一] *參見 per
aevum [age] * see aiw-
aevum [年代] *參見 aiw-

【引伸】
prime.vally
adv.（副詞）