Not regular; not conforming to a law, method, or usage
   recognized as the general rule; not according to common form; not
   conformable to nature, to the rules of moral rectitude, or to
   established principles; not normal; unnatural; immethodical;
   unsymmetrical; erratic; no straight; not uniform; as, an irregular
   line; an irregular figure; an irregular verse; an irregular physician;
   an irregular proceeding; irregular motion; irregular conduct, etc. Cf.
   Regular.