Aún no tenemos significados para "grumble unintelligibly".
1He grumbled unintelligibly or failed to answer at all.
2Wharton grumbled unintelligibly, but it was plain that he was not entirely displeased at his son's prank.
3Choosing a low, bushy pinyon tree as best suited to the purposes of a lazy climber, Stacy climbed it, grunting and grumbling unintelligibly.