Definition of preternaturally adverb from the Oxford Advanced Learner's Dictionary

 

preternaturally

 adverb
adverb
BrE BrE//ˌpriːtəˈnætʃrəli//
 
; NAmE NAmE//ˌpriːtərˈnætʃrəli//
 
(formal)
 
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in a way that does not seem natural; in a way that cannot be explained by natural laws The city was preternaturally quiet.