primeval
(British also primaeval)
https://gyazo.com/2c7ab7181a29c42f17482e5935364ff0
source: By NASA's Goddard Space Flight Center Conceptual Image Lab - Flickr, Public Domain
adjective
of or resembling the earliest ages in the history of the world:
原始(時代)の, 太古の; (星などの形成において)原始の.
e.g. mile after mile of primeval forest.
(of feelings or actions) based on primitive instinct; raw and elementary:
原始的な〈感情･欲求など〉
e.g. a primeval desire.
DERIVATIVES
primevally |prīˈmēv(ə)lē| (British also primaevally) adverb
ORIGIN
mid 17th century: from Latin primaevus (from primus ‘first’ + aevum ‘age’) + -al.