Unknown
Related: anonymous - curiosity - fear - mystery - the unknown soldier
Film titles: The Unknown (1927) - Tod Browning
"Fear is the most powerful emotion in the human race and fear of the unknown is probably the most ancient. You're dealing with stuff that everybody has felt; from being little babies we're frightened of the dark, we're frightened of the unknown. If you're making a horror film you get to play with the audiences feelings" -- John Carpenter
Uncertainty
Uncertainty is a term used in subtly different ways in a number of fields, including philosophy, statistics, economics, finance, insurance, psychology, engineering and science. It applies to predictions of future events, to physical measurements already made, or to the unknown. --http://en.wikipedia.org/wiki/Uncertainty [Nov 2006]
your Amazon recommendations