frigh
te
ning
ly
1
in a manner that causes intense fear
- The shadow moved frighteningly across the wall, making her freeze.
- His laughter echoed frighteningly in the empty hallway.
- The machine whirred frighteningly before sparking to life.
- She stared frighteningly into the darkness, sensing something unseen.
- The ice cracked frighteningly beneath their feet as they ran.