Unscheduled
Part of speech: adjective
Definition: Not scheduled; impromptu
Extra
Part of speech: noun
Definition: A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundryan extra edition of a newspaper, which is printed outside of the normal printing cycle
Part of speech: adverb
Definition: To an extraordinary degree.
Part of speech: adjective
Definition: Beyond what is due, usual, expected, or necessary; additional; supernumerary.Extraordinarily good; superior; as extra work, extra pay.
Example sentence: It is an extra dividend when you like the girl you've fallen in love with.