unforeseen
adjective
[ ʌnfɔːˈsiːn ]
• not anticipated or predicted.
• "our insurance package enables you to protect yourself and your dependants against unforeseen circumstances"
Similar:
unpredicted,
unexpected,
unanticipated,
unplanned,
accidental,
unlooked for,
unsought,
not bargained for,
unthought of,
unimagined,
sudden,
abrupt,
surprising,
startling,
astonishing,
abnormal,
out of the blue,