Regularly antonyms

What is the opposite word for Regularly?

• irregularly

  as a matter of usual practice, with little or no deviation
• erratically

  with little or no deviation, as a matter of usual practice
• uncommonly

  as a matter of usual practice
• unusually

  as a matter of usual practice
• unevenly

  with little or no deviation, as a matter of usual practice
• never

  with little or no deviation
• rarely
• on an irregular basis