'Unexpectedly' in the Bible

After Jesus was born in Bethlehem of Judea in the days of King Herod, wise men from the east arrived unexpectedly in Jerusalem,

[stay alert,] in case he should come suddenly and unexpectedly and find you asleep and unprepared.

“Be on your guard, so that your minds are not dulled from carousing, drunkenness, and worries of life, or that day will come on you unexpectedly

For you yourselves know perfectly well that the day of the [return of the] Lord is coming just as a thief [comes unexpectedly and suddenly] in the night.