irregular

unregelmäßig

Nonstandard; not conforming to rules or expectations

• The surface of the moon is irregular.

  Tatoeba · CM · CC BY 2.0 FR

unregelmäßig

Of a surface, rough

unregelmäßig

Without symmetry, regularity, or uniformity

unregelmäßig

Of a polygon, not regular; having sides that are not equal or angles that are not equalselten

unregelmäßig

Of a polyhedron, whose faces are not all regular polygons (or are not equally inclined to each other)selten

unregelmäßig

Of a word, not following the regular or expected patterns of inflection in a given languageselten

unregelmäßig

Having abnormal bowel movements at inconsistent intervalsselten