irreg.

Adjective

irregular (comparative more irregular, superlative most irregular)

1. Nonstandard; not conforming to rules or expectations.
   • ‘ “It would be most irregular Grandpa!” says Miss Cecily frowning and tapping her foot. “Well, we’re a pretty irregular family so that’s neither here nor there,” says the old man, impish like. [...] ’1967, Barbara Sleigh, Jessamy, Sevenoaks, Kent: Bloomsbury, published 1993, →ISBN, page 33
2. Of a surface, rough.

   Synonyms:

   coarse

3. Without symmetry, regularity, or uniformity.
   • The hovel stood in the centre of what had once been a vegetable garden, but was now a patch of rank weeds. Surrounding this, almost like a zareba, was an irregular ring of gorse and brambles, an unclaimed vestige of the original common.1944, Miles Burton, chapter 5, in The Three Corpse Trick

   Synonyms:

   unstable

4. Of a polygon, not regular; having sides that are not equal or angles that are not equal.
5. Of a polyhedron, whose faces are not all regular polygons (or are not equally inclined to each other).
6. Of a word, not following the regular or expected patterns of inflection in a given language.
   • "Calves", "cacti", and "children" are irregular plurals.

   Synonyms:

   heteroclite

See all 9 meanings of irregular