'inner loneliness' is correct and is usable in written English.
You can use it to express a more complex emotion than just feeling lonely. For example, you might write: "This person suffered from a deep inner loneliness that seemed to follow them no matter where they went."
Or it joins one's own inner loneliness with the inner loneliness of many other people.
It ends a certain kind of inner loneliness.
She rejects those who attribute her husband's inner loneliness to his life in the suburbs.
His combination of brutish innocence and inner loneliness belongs wholly to the world of knockabout.
They express with gentle wit and verbal dexterity the outward comforts and inner loneliness of a well-accompanied family man.
But any sense of connectedness is illusory, sharply contrasted with an inner loneliness and a lack of real-world mobility.
The event called "We Rise," held in and around a massive warehouse, features a gallery of more than 150 artistic expressions of inner solitude, loneliness and confusion.
Just because we are alone does not mean we will feel that painful feeling of inner emptiness or loneliness.
At the time, I was extremely depressed and I began looking for every natural solution to my inner pain and loneliness.
Mike Myers could have made an episodic film of Shep Gordon's life and times, his meeting Jimi Hendrix, Janis Joplin, John Lennon, and Sharon Stone, but the comic Dr. Evil had a clear view of the movie's arc, attempting to explore something of Gordon's inner being, his loneliness despite being surrounded by loving and eccentric friends, for example.
Would it help if you knew the ache in your heart is your teacher, and loneliness your inner wisdom calling you back?
