No. It is a noun adjunct because 'history' is not modifying 'course' by being a characteristic or feature, the way 'historical document' defines a document.
Undergraduate can be an adjective or a noun. Noun -> The undergraduate failed the course. Adjective -> The freshman failed the undergraduate course.
Safe can be an adjective. It is also a noun.
Historical
of course
Long is an adjective. It's describing history, a noun. The adverb is very.
If it passes the adjective test in the syntax, then yes--linguistically speaking of course.
There is no such word as prehistorical. The adjective is prehistoric (before recorded history).
Why= adverb is= verb it= pronoun important= adjective "to remember" is an infinitive phrase acting as an adjective. the= adjective lessons= noun of= preposition history= noun
historical
Historic, historical, histrionic
Of course, deepness is a word. It is an adjective.
how did the emperor diocletian affect the course of roman history