rational

"She is ill, but she is quite rational."

Faria, since their first acquaintance, had been on all points so rational and logical, so wonderfully sagacious, in fact, that he could not understand how so much wisdom on all points could be allied with madness.

He was, too, very learned, and rational enough on all points which did not relate to his treasure; but on that, indeed, he was intractable.”

It would surely be much more rational if conversation instead of dancing made the order of the day.”