We might have been able to say 20 years ago that it was unanticipated consequence, but we know now that a shipload could bring in a bunch of invasive species into the Great Lakes.

For even the very wise cannot see all ends.

unanticipated rise in fuel costs.

The unanticipated uses are almost always the most interesting.

London, December 1915. In the master bedroom (never was the estate agent's epithet more appropriate) of Flat 21, Carlyle Mansions, Cheyne Walk, Chelsea, the distinguished author is dying - slowly, but surely. In Flanders, less than two hundred miles away, other men are dying more quickly, more painfully, more pitifully - young men, mostly, with their lives still before them, blank pages that will never be filled. The author is seventy-two. He has had an interesting and varied life, written many books, travelled widely, enjoyed the arts, moved in society (one winter he dined out 107 times), and owns a charming old house in Rye as well as the lease of this spacious London flat with its fine view of the Thames. He has had deeply rewarding friendships with both men and women. If he has never experienced sexual intercourse, that was by his own choice, unlike the many young men in Flanders who died virgins either for lack of opportunity or because they hoped to marry and were keeping themselves chaste on principle.

Any language is necessarily a finite system applied with different degrees of creativity to an infinite variety of situations, and most of the words and phrases we use are prefabricated in the sense that we don't coin new ones every time we speak.