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Webster 1828 Edition

Adj.

Not prepared; not ready; not fitted or furnished by previous measures.

Not prepared by holiness of life for the event of death and a happy immortality.

unprepared ‎(comparative more unprepared, superlative most unprepared)

Not prepared; caught by surprise.
The castle was unprepared for the assault.

not prepared

Irish: neamhullamh
Russian: неподгото́вленный (ru) ‎(nepodgotóvlennyj), негото́вый (ru) ‎(negotóvyj)
Spanish: desapercibido (es)

unprepared ‎(plural unprepareds)

A black mark given to a pupil who arrives at a lesson without the necessary items or preparation.
- 1983, Ronald B. Lansing, Skylarks and lecterns: a law school charter (page 116)
  "He's got another rule: Whenever he gets three unprepareds in a row, he leaves the classroom."