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.

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