Unexpected
Synonyms: Unforeseen, unpredicted, unlooked for, out of the blue, without notice, fortuitous, serendipitous, sudden, surprising, astonishing, abnormal, backasswards, unanticipated, not bargained for, unhoped for, without warning, chance, unplanned, adventitious, abrupt, startling, uncommon, and extraordinary.
Example Sentences
The unexpected news surprised everyone.
We encountered unexpected delays today.
An unexpected guest arrived early.
His reaction was completely unexpected.