Definitions of irregularly:

• adverb:   in an irregular manner

  Example: "The stomach mucosa was irregularly blackened"

• adverb:   in an irregular manner

  Example: "Her letters arrived irregularly"

• adverb:   in an irregular manner

  Example: "The patient is breathing irregularly"

• adverb:   having an irregular form

  Example: "Irregularly shaped solids"