Your roommate celine is normally an active person, but over the last two weeks she has remained in the apartment for several days. she won't talk to her friends when they call, and she seems to have no appetite. celine is most likely suffering from

Celine is most likely suffering from  "clinical depression".

Depression ranges in seriousness from mild, brief scenes of pity to serious, relentless despondency. Clinical depression is the more-extreme type of sorrow, otherwise called significant misery or real depressive issue. It isn't the same as sorrow caused by a misfortune, for example, the demise of a friend or family member, or a restorative condition, for example, a thyroid issue.  

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