The Greek adjective eupeithēs (εὐπειθής) means easy to persuade to good, readily obedient, compliant, tractable. From eu (good, well) and peithō (to persuade, to obey), it describes a disposition that is not stubborn or resistant but readily yields to good counsel and God's direction. It appears once in the NT — James 3:17.
James 3:17 gives a beautiful sevenfold description of the wisdom that comes from above, and eupeithēs is one of its marks: "But the wisdom from above is first pure, then peaceable, gentle, open to reason (eupeithēs), full of mercy and good fruits, impartial and sincere." The ESV renders it "open to reason"; others translate it "submissive, compliant, willing to yield." This is not weakness — it is the strength to not insist on one's own way when a better way is shown. Earthly wisdom is defensive and argumentative; heavenly wisdom is secure enough to yield. The wise person is not easily manipulated, but is readily responsive to God and to righteous counsel.