1.
old-looking; aged; worn; weathered
Describes something that shows visible signs of age or wear. Used as a pre-noun modifier (the past-tense form of the verb 古びる, functioning adjectivally).
Usage
古びた is the past-tense form of the verb 古びる (to become old-looking), used as a pre-noun modifier. It describes objects that have taken on an aged appearance through the passage of time.
古びた is neutral — it can suggest charm and character (like antiques) or simply describe something showing wear. Compare with 古い, which simply means "old" without emphasizing the visual impression of aging.