unexpected

un-ik-SPEK-tid/ʌnɪkˈspɛktɪd/

2 meanings of unexpected

1
adjective
Not expected, anticipated, or foreseen; coming as a surprise.
The CEO's unexpected resignation left the board scrambling for a replacement.
After days of clear skies, the storm was entirely unexpected.
Similarunforeseen, surprising, sudden, unanticipated, unplanned
Oppositeexpected, predictable, anticipated
2
nounrarecountable or uncountable
A person or thing that is not expected, anticipated, or foreseen.
Seasoned detectives train themselves to anticipate the unexpected.
Every unexpected that walked through the clinic doors tested the staff's readiness.

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Formed from the prefix "un-" (not) combined with "expected."