primeval vs primaeval

primeval and primaeval both are adjectives.

Word	Noun	Adjective	Verb	Adverb
primeval	No	Yes	No	No
primaeval	No	Yes	No	No

As adjectives, primeval and primaeval are synonyms defined as:

primeval and primaeval: having existed from the beginning; in an earliest or original stage or state

Other synonyms of primeval include aboriginal, primal, primordial.

primeval (adjective)	primaeval (adjective)
having existed from the beginning; in an earliest or original stage or state	having existed from the beginning; in an earliest or original stage or state