extemporaneous - Dictionary definition and meaning for word extemporaneous
TEMPORARILY done in haste and so not planned.
remember an extempore that we did in school which was spontaneous and NOT PLANNED
my GRE ex attempt was poor b'coz it was not planned...
EXecuted TEMPORArily...coz its not planned...!!!
EX means "without," and TEMPOR means "time." Thus EX TEMPOR means without time.
Think of Extempore, where you are given a word and you have to give a small lecture on it.