1. expressing or suggesting the intention to cause harm or danger
2. likely to cause harm or have a dangerous outcome

Examples

• The bully sent threatening messages to his classmates.
• Dark clouds gathered in a threatening manner overhead.
• She received a threatening phone call late at night.
• The dog’s threatening growl made everyone step back.
• Rising sea levels pose a threatening challenge to coastal cities.
• His threatening tone made the conversation very uncomfortable.
• The storm looked threatening as it approached the shore.