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Adjective: unprepared  ,ún-pri'peh(r)d
  1. Without preparation; not prepared for
    "unprepared remarks"; "the shock was unprepared"; "our treaty makers approached their immensely difficult problems unprepared"

See also: ad-lib, extemporaneous, extemporary, extempore, impromptu, offhand, offhanded, off-the-cuff, spur-of-the-moment, unready, unrehearsed

Antonym: prepared