I'm so lonely.
That dog is lonely!
I'm not lonely..
The little girl had been feeling lonely since her best friend moved to another city.
The lonely old man at the park is color blind.
Her friend, Jack was a lonely farmer.
A common usage would be "I'm feeling lonely." A bit more verbose, "Mark felt lonely when he couldn't visit any of his friends."
Not exactly, although I guess it depends on what you have before it.
The 'Little Theatre' is going to present Othello. Ladies and gentlemen let me present to you Sargent Pepper's Lonely Hearts Club Band!
Swindlers often target vulnerable people such as the elderly and the lonely.
The SETTLER felt lonely on the frontier and longed for LETTERS from home
In this sentence there are two adjectives and two nouns. The first pair is "lonely man." "Lonely" is the adjective describing the noun "man." The second pair is "dilapidated house," where the noun "house" is described by the adjective "dilapidated."
He is a lifelong conman who managed to bamboozle lonely, wealthy widows out of millions.
As the longstanding matriach of the family, it will be lonely since she will be away for the holidays.
He is a lifelong conman who managed to bamboozle lonely, wealthy widows out of millions.