unplanned Synonyms

unintentional unwitting unorganised unstructured unrehearsed offhanded off-the-cuff ad lib ad hoc unforeseen incidental unsystematic unwilled unstudied unready unmeant not planned serendipitous unintended unthought unprompted unpredicted undevised uncalculated unanticipated unannounced self-sown unscheduled out of the blue hit-or-miss undesigned unpremeditated unprepared unlooked-for unexpected fortuitous fluky extempore extemporaneous extemporal desultory designless coincidental chance casual aleatory aimless adventitious ad libitum accidental