Monatomic refers to an element or molecule that exists as a single atom, rather than a bonded group. Some common synonyms for monatomic include indivisible, solitary, atomic, and simple. Indivisible refers to the fact that the atom cannot be broken down any further, while solitary emphasizes the atom's singular nature. Atomic refers more specifically to the scientific definition of a single atom. Simple emphasizes the atom's uncomplicated structure and lack of complexity. Other potential synonyms for monatomic include unpaired, alone, and singular, though these may not be as commonly used in scientific contexts.