Bad / Unhappy
troubling - Causing worry, distress, or concern.
crestfallen - Sad and disappointed, because something one was hoping for did not happen.
misery - A state of great suffering or unhappiness, especially caused by emotional or physical pain.
morose - Sullen, gloomy, or depressed in mood.
sullen - Gloomy or depressing in mood or appearance.
miserable - Very unhappy or sad — feeling deep emotional pain or sorrow.
sorrow - A feeling of deep sadness or grief, especially caused by loss or disappointment.
loner - A person who does not conform to social norms or seek companionship.
heartbroken - Very sad and upset, usually from experiencing a great loss.
grief - Intense sadness experienced after a significant loss, usually the death of a person one loves
moody - Having moods that change often, resulting in often being unhappy or unfriendly
grouch - A person who is in a bad mood and complains a lot.