unpredictably
/ˌʌnprɪˈdɪktəbli
/adverb
In a way that cannot be predicted: it is known that wildfires behave unpredictably...
- Once things get rolling on the night of the robbery, the events unfold quite unpredictably.
- The waves of fortune wash all too unpredictably on the shores of the Caribbean islands.
- He swung unpredictably from bawdy humour to bad temper.