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Adverb: irregularly  i'reg-yu-lu(r)-lee
  1. At an uneven rate
    "the patient is breathing irregularly"
     
  2. Having an irregular form
    "irregularly shaped solids"
     
  3. With varying time intervals between
    "the stomach mucosa was irregularly blackened"; "her letters arrived irregularly";
    - on an irregular basis

Antonym: on a regular basis, regularly