Use the adjective sapient to describe someone who always gives the smartest advice, like your brilliant, insightful teacher or your wise little brother.

Pronunciation: / 'sepɪənt/
English Description: having or prompted by wisdom or discernment
Chinese Translation: 聪明的(cong1 ming2 ce)
Spanish Translation: sapiente
STORY: Calling someone sapient is a compliment, since it means "insightful and wise," although it's often used in a sarcastic way: "My sapient adviser said I should major in Communications." The phrase "sapient life forms" shows up frequently in science fiction, as well. The Latin root is the verb sapere, "to be wise," which is also the origin of sapiens, "wise man," as in Homo sapiens, or the human species.

EXAMPLE SENTENCE:

If she were to be safe, there was much he had to do in that other world, the only one that most sapient souls know.

*New word description, story and part of "EXAMPLE SENTENCE" are cited in Vocabulary.com