Synonyms: Concave, dented, hollow, dished, indented, recessed, sunken
Antonyms: Bulging, cambered, convex, protruding, protuberant
Depressed is a 2nd and 3rd form for a word "DEPRESS."
Depress: 1. (Of a person) in a state of unhappiness or despondency.
2. Make (someone) feel utterly dispirited or dejected.
Ram was in a depressed mood.