Uncertainty
Uncertainty has been called "an unintelligible expression without a straightforward description". It describes a situation involving insecurity and/or unknown information. It applies to predictions of future events, to physical measurements that are already made, or to the unknown. Uncertainty arises in partially observable and/or stochastic environments, as well as due to ignorance, indolence, or both. It arises in any number of fields, including insurance, philosophy, physics, statistics, economics, finance, psychology, sociology, engineering, metrology, meteorology, ecology and information science.
Uncertainty
From that point, my universe went on crumbling; new cracks appeared all the time. I could see that the pleasant securities of childhood, all of those warm little human emotions, all of those trivial aims and purposes that we allow to rule our lives, were an illusion. We were like sheep munching grass, unaware that the butcher's lorry is already on its way. I got used to living with a deep, underlying feeling of uncertainty that no one around me seemed to share. It was rather like living on death row.
Colin Wilson in Alien Dawn, pp. 12-13 (1998)
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