She had never been so lonely.

Source: Tatoeba

This lonely patient takes pleasure from sewing.

Source: Tatoeba

To tell the truth, I felt lonely.

Source: Tatoeba

Lonely people perpetuate their own loneliness through their fear of others.

Lonely people tend to be afraid of meeting others, which ensures they will always be lonely.

Source: Tatoeba

Loneliness and being alone are not the same thing.

Source: Tatoeba