(adj): proceeding to a conclusion by reason or argument rather than intuition
(adj): logically deductive
(adj): based on exact thinking
(adj): based on known statements or events or conditions
(adj): vs. invalid) -- (well grounded in logic or truth or having legal force
(adj): vs. incoherent), consistent, logical, ordered -- (marked by an orderly, logical, and aesthetically consistent relation of parts
(adj): perfectly consistent and coherent
(adj): capable of thinking and expressing yourself in a clear and consistent manner
(adj): vs. irrational) -- (consistent with or based on or using reason
