Oxford Advanced American Dictionary

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

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threatening

adjective
threatening pronunciation English ˈθretnɪŋ threatening pronunciation American ˈθretnɪŋ
 
1 expressing a threat of harm or violence
Synonym
menacingthreatening lettersthreatening behaviourThe house seemed less threatening in the cold light of day.2 (of the sky, clouds, etc.) showing that bad weather is likelyThe sky was dark and threatening.threateningly
threateningly pronunciation English ˈθretnɪŋli threateningly pronunciation American ˈθretnɪŋli
adverbHe glared at her threateningly.