Definition of unpremeditated adjective from the Oxford Advanced Learner's Dictionary

 

unpremeditated

 adjective
adjective
BrE BrE//ˌʌnpriːˈmedɪteɪtɪd//
 
; NAmE NAmE//ˌʌnpriːˈmedɪteɪtɪd//
 
(formal)
 
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(of a crime or bad action) not planned in advance opposite premeditated
See the Oxford Advanced American Dictionary entry: unpremeditated