thought
sentient
The word you're looking for is "imaginary." It refers to something that exists only in thoughts or fantasies, rather than in reality. Imaginary concepts or entities are often created by the imagination and do not have a physical presence.
A word that describes something that exists only in the mind is "phantasm." This term refers to an illusion or a figment of imagination, often representing something that is not grounded in reality. Another similar word is "fantasy," which denotes an imagined scenario or concept that lacks a basis in the physical world.
That person or thing exists only in his mind and is not real in the physical world.
Mythological means existing only in the imagination so, by definition, no mythological creature really exists.
Sonic, of course. Freddy only exists in your mind.....
Imaginary friends, dreams, and abstract concepts like time or justice exist only in the mind. They are subjective experiences created by our thoughts and perceptions.
Solipsism is the philosophical belief that the only thing that can be known to exist is one's own mind, and that everything else, including the external world and other minds, is either uncertain or does not exist. It is essentially the idea that reality is subjective and only exists within one's own consciousness.
Hygiene is a seven letter word and it means cleanliness.
George Berkeley is a prominent proponent of idealism. He believed that reality exists in the mind and that objects only exist when perceived. This contrasts with materialism, which posits that the physical world is all that exists.
Pennsylvania come to mind
Jot is the only one thaht comes to mind.