1Of a person: not disposed to peace; restless, argumentative, disruptive. Also (of an action, intention, etc.): involving or tending towards aggression, argument, or conflict.
2Characterized by lack of peace; violent, hostile, turbulent. Also in early use (of the sea): †rough, stormy (obsolete).
Late Middle English; earliest use found in The Wycliffite Bible (early version). From un- + peaceable.