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.
One who is not regular; especially, a soldier not in regular service.
Man hath still either toys or care: But hath no root, nor to one place is tied, but ever restless and irregular, about this earth doth run and ride. He knows he hath a home, but scarce knows where; He says it is so far, that he has quite forgot how to go there. Henry Vaughan
If one undertakes retrospection of the day's events, one must do it regularly at the appointed hour, not fitfully, not doing it today, neglecting to do it tomorrow and the day after and then taking it up again on the fourth day. Such irregular practice is not conducive to the confirmation of the habit of retrospection. Mahavira