Abandoned

/əˈband(ə)nd/

having been deserted or left.

"an abandoned car"

unrestrained; uninhibited.

"a wild, abandoned dance"

Isolated
/ˈʌɪsəleɪtɪd/ far away from other places, buildings, or people;...

Lonely
/ˈləʊnli/ sad because one has no friends or company. "lonely old people...

Sad
/sad/ feeling or showing sorrow; unhappy. "I was sad and...

Emotions Wheel
I have enjoyed working with the emotions I found in Plutchik, but there are so many more...