unexpectedly unexpectedly /ˌənɪkˈspɛktɪdli/

adverb

1. () In a way that was not expected  ( out of the blue , unexpectedly )
   in a way that was not expected
    Her brother showed up at the wedding out of the blue
   her brother showed up at the wedding out of the blue
   
2. () Without advance planning  ( by chance , circumstantially , accidentally , unexpectedly )
   without advance planning
    They met accidentally
   they met accidentally