: presenting, suggesting, or constituting a menace or threat : threatening
a menacing look
menacing words
[Harold E. Edgerton] … was also one of the first to take photographs of the menacing mushroom cloud emanating from a nuclear blast. Benjamin Genocchio
Ransomware is a menacing scam that involves locking businesses out of their computers and demanding payment of a ransom in exchange for the return of company systems and data. Roger Williams
The image is chilling: a series of menacing bear traps laid out like footsteps. Emily DeNitto
menacinglyadverb
A man stepped menacingly from the corner brandishing a long pole … Elizabeth George Speare
"If you shout his name I will curse you into oblivion," muttered Tonks menacingly … J. K. Rowling
Word History
Etymology
Middle English manacyng, from present participle of manacen "to menace entry 2"