Idiosyncratic means-

The word "idiosyncratic" means:

"Eccentric"

Explanation:

Idiosyncratic refers to something peculiar or unique to an individual, often in an unusual or unconventional manner. It describes traits or behaviors that are characteristic of a person but not necessarily common or typical.

Usual means common or habitual, which is the opposite of idiosyncratic.

Aesthetic relates to beauty or art, which is not directly related to idiosyncratic.

Typical means representative or standard, which is contrary to idiosyncratic.

Thus, "eccentric" best captures the meaning of "idiosyncratic."