General synonyms:
* Solitary: Emphasizes being alone physically.
* Isolated: Suggests a feeling of being cut off from others.
* Alienated: Implies a feeling of being different or not belonging.
* Desolate: Creates a sense of emptiness and despair.
* Forsaken: Conveys a feeling of being abandoned.
* Alone: Straightforward and direct.
* Unaccompanied: Focuses on the lack of companionship.
More specific options:
* Yearning: Expresses a longing for connection.
* Melancholy: Suggests a sense of sadness and introspection.
* Depressed: Indicates a more severe state of emotional distress.
* Heartbroken: Implies a feeling of loss and grief.
* Disconsolate: Conveys a sense of hopelessness and despair.
* Miserable: Expresses a strong feeling of unhappiness.
* Wistful: Suggests a longing for something that is lost or unattainable.
Informal expressions:
* Down in the dumps: A casual way to say someone is feeling sad.
* Blue: A simple, everyday term for feeling sad or lonely.
* Lonesome: A more informal way of saying lonely.
The best word to use will depend on the specific situation and the emotions you want to convey.