Where does “gruntingly” come from?
gruntingly (English) comes from English grunting, from Middle English gruntynge, from Middle English grunten, from Old English grunnettan, from Proto-West Germanic *grunnattjan, from Proto-Germanic grunnatjaną, from Proto-Germanic grunnōną, from Proto-Indo-European gʰrun- — to shout.
gruntingly (English): With a grunting sound
Ancestry of “gruntingly”, step by step