Adverb
in a harsh and grating manner
Source: WordNether voice fell gratingly on our ears Source: Internet
Bill is tasked with being partners with Slim, the psychopathic, "covetous, gratingly pansexual Irish bastard" who paid to him Bill and his wife killed, and it starts about how you'd expect. Source: Internet
The music goes through fitful episodes, with percolating riffs, pummeling percussion and gratingly dissonant clusters. Source: Internet