unforeseeable
adjective
- unable to be forseen
Wiktionary
adj
Etymology: Etymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Germanic *un- Proto-West Germanic *un- Old English un- Middle English un- English un- English foreseeable English unforeseeable From un- + foreseeable.
- Incapable of being foreseen or anticipated.
“Traincrew management has always been a bit of a black art, rather than a science. The present traincrew difficulties that beset the UK rail industry are neither new nor were they unforeseeable.”