• nonstandard; not conforming to rules or expectations
  • rough
  • without symmetry, regularity, or uniformity
  • not regular; having sides that are not equal or angles that are not equal
  • whose faces are not all regular polygons (or are not equally inclined to each other)
  • not following the regular or expected patterns of inflection in a given language


  • A soldier who is not a member of an official military force and who may not use regular army tactics.
  • One who does not regularly attend a venue.


Similar words

Opposite words


  • From Middle English irreguler, from Old French irreguler, from Medieval Latin or Late Latin irrēgulāris, from in- + regularis, equivalent to ir- + regular.

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