na-adjective
Describes a person, attitude, or approach that is scholarly, bookish, or focused on academic study rather than practical concerns.
彼は学究的な態度で問題に取り組んだ。
He approached the problem with a scholarly attitude.
その議
The discussion is too academic and hard for ordinary people to understand.
アカデミック is a loanword often used in modern contexts for 'academic' in the sense of higher education or research, whereas 学究的 carries a more traditional, perhaps slightly formal nuance of scholarly devotion.
Compound of 学究 (がっきゅう, 'scholarly research') + 的 (てき, '-like, -ical'). The word 学究 is itself a combination of 学 (がく, 'learning') and 究 (きゅう, 'to investigate thoroughly').