The Oxford Thesaurus An A-Z Dictionary of Synonyms - logical adj.

1) syllogistic(al) , inferential, deductive, inductive: Her argument follows basic logical criteria. 2) reasonable, plausible, sensible, sound, valid, intelligent, judicious, practical, rational, wise, proper: Is it logical to assume that people will believe you? 3 well-organized, sound, coherent, consistent, sensible, rational, reasonable, well-reasoned, well-thought-out: The proposal is set forth in a logical fashion, from premise to conclusion.