Irregularly

As to the fragments of morality that are irregularly and thinly scattered in those books, they make no part of this pretended thing, revealed religion.

The Earth is an irregularly shaped ellipsoid.

Although anciently and irregularly built, this market-town is much resorted to by the neighbouring gentry, not less for the beauty of its position, than for the famed salubrity of its air.

Have you noticed that your heart sometimes beats irregularly?

There are verbs that conjugate very irregularly in French. For example, the verb "ouïr".

A woman may have every quality or attribute of marriageableness who menstruates irregularly, or rarely, or even who has never menstruated at all.

Seed micromorphology:—Seed coat is laticostate. Epidermal cells are elliptical to irregularly pentagonal. Cell walls are thickened mostly at the corners, the boundaries are raised […]