irregular; undisciplined; disorganized
Describes a lack of regularity, discipline, or order in behavior, habits, or systems. Often used for lifestyle, work, or schedule.
An irregular lifestyle is bad for your health.
His way of working is disorganized.
Compound of 不 (fu, 'not') and 規律 (kiritsu, 'discipline, order'). The exact historical derivation is uncertain, but the meaning follows directly from its components.