Definition of erratic

• a. - Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars.
• a. - Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.
• a. - Irregular; changeable.
• n. - One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.
• n. - A rogue.
• n. - 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.