unplanned Synonyms

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