adj irregular; changeable.
2. erratic ·noun a rogue.
3. erratic ·adj deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
4. erratic ·noun one who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.
5. erratic ·noun any stone or material that has been borne away from its original site by natural agencies; ·esp., a large block or fragment of rock; a bowlder.
6. erratic ·adj having no certain course; roving about without a fixed destination; wandering; moving;
hence, applied to the planets as distinguished from the fixed stars.