adjective

(of a person) in a state of unhappiness or despondency.

she felt lonely and depressed

sad,saddened,unhappy,gloomy,glum,melancholy,miserable,sorrowful,dejected,disconsolate,downhearted,downcast,cast down,down,crestfallen,woebegone,despondent,dispirited,low,low in spirits,low-spirited,heavy-hearted,morose,dismal,desolate,weighed down,oppressed,tearful,upset,broken-hearted,disheartened,discouraged,daunted,pessimistic,blue,down in the dumps,down in the mouth,fed up,moody,dolorous,heartsick,heartsore,chap-fallen