unpredictably

US /ˌʌn.prɪˈdɪk.tə.bli/
UK /ˌʌn.prɪˈdɪk.tə.bli/
1.

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in a way that is likely to change suddenly and without reason:

:
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The disease seems to strike unpredictably, appearing in patients with no family history.
:
unpredictable