Indefinite Adjectives in Greek grammar, also known as Αόριστα Επίθετα, are used when the speaker does not refer to a specific thing or individual but rather something vague or unspecific. This category of adjectives doesn’t indicate a particular quality, but only the existence of a quality. A few examples of indefinite adjectives are σπάνιος (rare), κάποιος (some), and διάφορος (various).