Lonely
Part of speech: adjective
Definition: Of person, unhappy by feelings of loneliness. Of place, unfrequented by people; desolate. Of person, without companions; solitary.
Example sentence: I have so many different personalities in me and I still feel lonely.
Dejected
Part of speech: adjective
Definition: Sad and dispirited.
Part of speech: verb
Definition: Make sad or dispirited.
Example sentence: When I did these psychological characters like the drug addicts, the ones who were rejected and dejected, I started to feel a sort of melancholia which was very unnatural for me to have at a teenage. Then I avoided those characters.