sage
noun
adjective
he makes some very sage comments in his book:
wise, learned, clever, intelligent, with/showing great knowledge, knowledgeable, sensible, intellectual, scholarly, sagacious, erudite;
discerning, judicious, canny, penetrating, perceptive, acute, astute, shrewd, prudent, politic, thoughtful, full of insight, insightful, percipient, perspicacious, philosophical, profound, deep;
rare sapient.
▷antonyms foolish.
sage (2) Oxford Dictionary of English