logical

capable of or reflecting the capability for correct and valid reasoning; "a logical mind"

based on known statements or events or conditions; "rain was a logical expectation, given the time of year"

marked by an orderly, logical, and aesthetically consistent relation of parts; "a coherent argument"

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"