GOODBYE
One word that can describe the sound of unhappiness is "gloomy."
Displeased.
If you already feel that he is not the one and unhappy the best thing for you to do is be honest, polite and upfront and make a clean cut - move on. There is no since wasting anymore of one anothers time being unhappy - it is time to move on in your separate directions.
If you truly love someone, they should already make you happy in life. It is if you don't love them then you are unhappy. It would have to be based upon your situation what you choose to do. If you love someone, and you are unhappy with who they are or what they do in life, then you should talk to them and try to help them with their problems if you truly love them. I would recommend that you try and talk things over with that person before deciding to make any drastic measures, because one day you may become very unhappy while that person is out of your life.
Tell them that you are unhappy. Be honest. if they do not know that you are unhappy, and are happy with you, they will find a way to make you happy. If they know you're unhappy, and they love it, you're probably married to them. Good luck with that one.
According to Taxpayer Alliance it is one word.
you go to someone's suite and click one of the smiley and unhappy faces. there. done
The word grumpy is an adjective. Someone who is grumpy is unhappy or irritable. Grumpy is also one of the seven dwarfs.
synonyms: sad · miserable · sorrowful · dejected · despondent · disconsolate · morose · [more] (unhappy at/about/with) not satisfied or pleased with (a situation). "many were unhappy about the scale of the cuts" synonyms: dissatisfied · displeased · discontented · disappointed · disgruntled · disapproving of unfortunate. "an unhappy coincidence" synonyms: unfortunate · unlucky · luckless · hapless · ill-starred · ill-fated · [more]
One common prefix is "un-", which is used to indicate the opposite or absence of the base word. For example, in the word "happy," adding the prefix "un-" changes the meaning to "unhappy."
The key word in your question is the word "do". Get up and do something. Do make a difference. Do help someone. Do one random act of kindness a day.