intuitive

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, or arising from intuition: synonym: instinctive.
• adjective Possessing or demonstrating intuition.
• adjective Easily understood and simple to use.

from The Century Dictionary.

• Perceiving directly, without a medium, vicarious representation, symbol, or phenomenon; perceiving the object immediately as it exists.
• Pertaining to a knowledge (especially, but not exclusively, an immediate knowledge) of a thing as existent.
• Not determined by other cognitions; not discursive; of the nature of a first premise; immediate; self-evident; reached without reasoning by an inexplicable and unconscious process of thought.
• Presenting an object as an individual image; not general.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Seeing clearly
• adjective Knowing, or perceiving, by intuition; capable of knowing without deduction or reasoning.
• adjective Received, reached, obtained, or perceived, by intuition; ; -- opposed to deductive.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective spontaneous, without requiring conscious thought
• adjective easily understood or grasped by intuition
• adjective having a marked degree of intuition
• noun One who has (especially parapsychological) intuition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective obtained through intuition rather than from reasoning or observation
• adjective spontaneously derived from or prompted by a natural tendency