What's the adjective for soliloquy? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs sole, solo and soliloquy which may be used as adjectives within certain contexts.
solitary
Living or being by oneself; alone; having no companion present; being without associates.
Performed, passed, or endured alone; as, a solitary journey; a solitary life.