Erratic

Part of speech: noun (n.)

1. One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.

2. A rogue. [Obs.] Cockeram.

3. 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.

Part of speech: adjective (a.)

1. Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars. The earth and each erratic world. Blackmore.

2. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer; as, erratic conduct.

3. Irregular; changeable. "Erratic fever." Harvey. Erratic blocks, gravel, etc. (Geol.), masses of stone which have been transported from their original resting places by the agency of water, ice, or other causes. -- Erratic phenomena, the phenomena which relate to transported materials on the earth's surface.