Noah Webster's Dictionary (a.) Not expected; coming without warning; sudden.

Multi-Version Concordance Unexpected (2 Occurrences) Luke 12:40 Therefore be ready also, for the Son of Man is coming in an hour that you don't expect him." (See RSV) Acts 15:19 "My judgement, therefore, is against inflicting unexpected annoyance on those of the Gentiles who are turning to God. (WEY)