Adverb
in a horrifying manner
Source: WordNetNo matter how many people you kill, using a machine gun in battle is not a war crime because it does not cause unnecessary suffering; it simply performs its job horrifyingly well. Sebastian Junger
he laughed horrifyingly Source: Internet
I selectively ignored the more horrifyingly dated bits (a subject for another, more serious occasion). Source: Internet
Although the officer involved in Philando’s death was not convicted of murder, there is no question that the killing of Philando Castile was completely unnecessary and horrifyingly unjust. Source: Internet
It would be horrifyingly ironic if the only caribou we had left were those noble statues that commemorate our long-fallen war dead. Source: Internet
The german's have it worked out about the best it is why their mortality rate is so low but still horrifyingly high. Source: Internet