inexplicably

US /ˌɪn.ɪkˈsplɪk.ə.bli/
UK /ˌɪn.ɪkˈsplɪk.ə.bli/
1.

khó hiểu

in a way that cannot be explained or understood:

:
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Inexplicably, the men were never questioned about where the explosives came from.