Having made no preparations.

without preparation; not prepared for; "unprepared remarks"; "the shock was unprepared"; "our treaty makers approached their immensely difficult problems unprepared"- R.E.Danielson[ant: prepared ]

adjective

ad-lib * , caught off guard , ill-considered , impromptu , improvised , napping , not prepared , offhand , off the cuff * , off the top of one’s head , played by ear , spontaneous , surprised , taken off guard , unaware , unexpected , unplanned , unready , unrehearsed , unschooled , unskilled , untrained , vulnerable , winged * , asleep , raw , uncooked , unguarded