analytical,
analytic of a proposition that is necessarily true independent of fact or experience; "`all spinsters are unmarried' is an analytic proposition"
ordered,
coherent,
consistent,
logical having a systematic arrangement; especially having elements succeeding in order according to rule; "an ordered sequence"
synthetical,
synthetic of a proposition whose truth value is determined by observation or facts; "`all men are arrogant' is a synthetic proposition"
rational having its source in or being guided by the intellect (as distinguished from experience or emotion); "a rational analysis"
dianoetic,
discursive proceeding to a conclusion by reason or argument rather than intuition
formal being in accord with established forms and conventions and requirements (as e.g. of formal dress); "pay one's formal respects"; "formal dress"; "a formal ball"; "the requirement was only formal and often ignored"; "a formal education"
logical -
marked by an orderly, logical, and aesthetically consistent relation of parts; "a coherent argument"
valid still legally acceptable; "the license is still valid"
logical -
capable of thinking and expressing yourself in a clear and consistent manner; "a lucid thinker"; "she was more coherent than she had been just after the accident"