unpremeditated
adjective uk/ˌʌn.priːˈmed.ɪ.teɪ.tɪd/ us/ˌʌn.priːˈmed.ɪ.teɪ.t̬ɪd/
(犯罪等)不是有预谋的,非事前策划的
(especially of a crime or something unpleasant) done without being planned
Opposite: premeditated
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