they can get depressed and react
That would be a friend.
animals die in zoos caused by stress and loneliness
Probably yes. Loneliness is a very sad state and can cause suffering and despair . . . and this feeling is very often aggravated in elderly people.
Being the "one and only" to someone.
Yes
Leave me alone! ...with my loneliNESS, PLEASE! Leave me alone! ...with my loneliNESS, PLEASE! Leave me alone! ...with my loneliNESS, PLEASE! Leave me alone! ...with my loneliNESS, PLEASE! Leave me alone! ...with my loneliNESS, PLEASE! Leave me alone! ...with my loneliNESS, PLEASE!
In their loneliness and miserable state of mind they may wish not to live.
No. It extinguishes from lack of oxygen.
Loneliness has 3 syllables.
There are no patron saints of loneliness.
Loneliness is prefix or suffix