Threateningly [adverb]
Definition of Threateningly:
dangerously, critically
Sentence/Example of Threateningly:
“Tell me first who did this thing,” he challenged, threateningly.
"I am going to give you the facts," began Hatteras, threateningly.
When she was gone the two brothers eyed each other threateningly.
He finally ordered them away, and acted so threateningly that they retired.
"You will see that I can scratch," she rejoined, threateningly.
Only the roar outside was real—terribly, threateningly real.
"I shall kill you if you don't," said Lenoir, threateningly.
"We have a good deal more to say than we had when we were poor," said Lou threateningly.
When she recognized M. Vulfran she raised her arm to him threateningly.
He stepped forward, threateningly, his face dark with wrath.