Sorrowful
Part of speech: adjective
Definition: Of a person, full of sorrow; exhibiting sorrow; sad; dejected; distressed. Producing sorrow; exciting grief; mournful; lamentable; grievous.
Example sentence: There's a formula Chris and I used all the time. When you least feel like it, do something for someone else. You forget about your own situation. It gives you a purpose, as opposed being sorrowful and lonely. It makes me feel better when things are too hard for me.
Heartbreaking
Part of speech: adjective
Definition: That causes great grief, anguish or distress.
Example sentence: The experience of watching other standups is either: 1) you see your mate doing standup and it's really bad and you're heartbroken, or 2) You see your mate doing really well and it's heartbreaking.