What is the opposite of nonthreatening?

Need antonyms for nonthreatening? Here's a list of opposite words from our thesaurus that you can use instead.

Sinister or evil in nature
“I pray that the supplicant's family may be spiritually fortified against the pernicious intent of malicious people.”
(colloquial) Causing or able to cause fright
Dangerous, involving risks
“In today's overheated financial markets, euphoric investors are once again happily financing risky ventures.”
Very serious in nature
“An emergency meeting has been called to address this nasty situation.”
Intimidating or aggressive in nature
“Stay away from him because he is a crazy and dangerous man.”
Serious or significant in nature
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