sinisterly

Example:He spoke malevolently about his ex-partner, spreading malicious rumors.

Definition:in a mean-spirited and vindictive manner

Example:The sky ominously darkened just before the storm hit.

Definition:in a way that suggests a catastrophic event is about to happen

Example:The dog barked menacingly at any stranger who approached.

Definition:in a threatening manner, threatening to cause harm

Example:His actions were evil and brought great harm to others.

Definition:morally reprehensible, causing or characteristic of suffering; wicked

Example:The teacher's tone was threateningly strict, clearly warning the students not to misbehave.

Definition:expressing or threatening to inflict harm, injury, punishment, or calamity