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from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Having no fixed or regular course; wandering.
  • adj. Lacking consistency, regularity, or uniformity: an erratic heartbeat.
  • adj. Deviating from the customary course in conduct or opinion; eccentric: erratic behavior.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. unsteady, random; prone to unexpected changes; not consistent
  • n. A rock moved from one location to another, usually by a glacier.
  • n. Anything that has erratic characteristics.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having no certain course; roving about without a fixed destination; wandering; moving; -- hence, applied to the planets as distinguished from the fixed stars.
  • adj. Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer.
  • adj. 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.

from The Century Dictionary and Cyclopedia

  • Wandering; having no certain course; roving about without a fixed destination.
  • Deviating from the proper or usual course in opinion or conduct; eccentric.
  • Moving; not fixed or stationary: applied to the planets as distinguished from the fixed stars.
  • In medicine, irregular; changeable; moving from point to point, as rheumatic or other pains, or appearing at indeterminate intervals, as some intermittent fevers.
  • In geology, relating to or explanatory of the condition and distribution of erratics. See II., 2.
  • n. One who or that which has wandered; a wanderer.
  • n. Specifically In geology, a boulder or block which has been conveyed from its original site, probably by ice, and deposited at a distance; an erratic block. See erratic blocks, under I.
  • n. An eccentric person.
  • In zoology, occurring in an unusual location.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. having no fixed course
  • adj. likely to perform unpredictably
  • adj. liable to sudden unpredictable change


Middle English erratik, from Old French erratique, from Latin errāticus, from errāre, to wander.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old French erratique, from Latin erraticus. (Wiktionary)



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    S: ROGUE, Unstable, Irregular, Inconsistent, Volatile, Eccentric, Strange

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  • "Except for a large, open circle in the center of the village, the Stonedown looked as erratically laid out as if it had fallen off the mountain not long ago."

    Lord Foul's Bane

    July 29, 2012