Diverging from a straight or exactly parallel position. (In early quots. figurative.)

Of things: Not in conformity with rule or principle; contrary to rule; disorderly in action or conduct; not in accordance with what is usual or…

Irregular, rambling, scattered.

Deviating from the right course or method; irregular, improper.

figurative. Regulated by no central control. Of actions, movements, and things in general: Irregular, anomalous, proceeding by no known method…

Vagrant or vague, in various senses; departing from or exceeding just or ordinary bounds; irregular, inordinate; unsettled, wandering.

Guided by no rule, capricious, irregular, strange.

Irregular, unmethodical.

Irregular, uncommon; not standard or even.