Adjective

1. Pertaining to subjects as opposed to objects (A subject is one who perceives or is aware; an object is the thing perceived or the thing that the subject is aware of.)
2. Formed, as in opinions, based upon subjective feelings or intuition, not upon observation or reasoning, which can be influenced by preconception; coming more from within the observer rather than from observations of the external environment.
3. Resulting from or pertaining to personal mindsets or experience, arising from perceptive mental conditions within the brain and not necessarily from external stimuli.
4. Lacking in reality or substance.
5. As used by Carl Jung the innate worldview orientation of the introverted personality types.
6. Experienced by a person mentally and not directly verifiable by others