irregular

epäsovinnainen

sääntöjenvastainen

epäsäännöllinen

epätasainen nonstandard Nonstandard; not conforming to rules or expectations.
{{quote-book
Of a surface, rough.
Without symmetry, regularity, or uniformity.
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{{quote-magazine|date=2013-01-01|author=Paul Bartel, Ashli Moore
{{quote-magazine|date=2013-07-19|author=http://www.theguardian.com/profile/iansample Ian Sample
puhekieltä Not regular; having sides that are not equal or angles that are not equal.
puhekieltä Whose faces are not all regular polygons (or are not equally inclined to each other).
A soldier who is not a member of an official military force and, often, does not follow regular army tactics.
One who does not regularly attend a venue.
2015, Brian Cook, Hands Across The Sea (page 190)

There's one neighborhood tavern where the regulars and irregulars go after a hard day to unlax and rewind, throw back a few, and just hang out - you know the one.