Frequency: The word is one of the 3000 most common words in English.
If an event or someone's behaviour is unexpected, it surprises you because you did not think that it was likely to happen.
His death was totally unexpected...
He made a brief, unexpected appearance at the office...
ADJ
• unexpectedly
Moss had clamped an unexpectedly strong grip on his arm...
ADV: ADV adj, ADV with v