Antonyms for the phrase "attended regularly" are plentiful. Some examples include "absent frequently," "infrequently showed up," "inconsistent attendance," "sometimes appeared," "occasional attendance," "sporadic presence," "rarely appeared," "intermittent attendance," "unreliable attendance," and "irregular showing up." These antonyms convey the opposite meaning to attending regularly, indicating only occasional, unreliable, intermittent or sporadic attendance. In contrast, attending regularly demonstrates a reliable, consistent presence that is important for success in many areas of life, such as school, work, or sports. Therefore, it's essential to cultivate a habit of attending regularly and avoiding the antonyms highlighted above.