is it straight, unipolar depression? does your friend have any mood variability or instability, such as being overly energetic, along with being mean?

i'm just mentioning that because a lot of depressed people end up being diagnosed with a form of bipolar disorder, and they never thought they could be bipolar.

hypomania, or the state below a full mania, can include just being a bear to be around (with other symptoms, but that's the main one you'd most likely observe).

being bipolar isn't always living on these god-like highs. it can feel like the world is closing in on you in a hypo or manic state, and the need to lash out may be pressing.

i'm NOT a medical professional and obviously can't diagnose anything. however, i'm trying to contribute ideas that haven't been mentioned.

just as in unipolar depression, bipolar people can be snarky.

i'd watch out for:
1. increased energy
2. decreased need for sleep
3. racing thoughts/quick speech
4. increased sexual promiscuity/activity (being perhaps irresponsible)
5. eating more or less than usual, usually less
6. exercising too much
7. starting strange projects.....

this probably doesn't ring a bell, but if it does, your friend should see the pdoc and get evaluated for perhaps a form of bipolar disorder.

just my thoughts.

I believe it's straight. No to 1,2, 3, 4, 6 and 7 :)

More like the opposite of all those. My friend is mostly aggressive at times and demeaning :( Sometimes she gets aggresive in the sense that she'll throw stuff around. Ie. If she's opening a package, and it becomes difficult, she'll throw the entire thing across the room.