2 adverbs to describe how to quack

"Pardon me!but I think not," said Bellew, shaking his head, "you see, I amerrather extravagant in my eating,eggs, you know, lots of 'em, and ham, and beef, ander(a duck quacked loudly from the vicinity of a neighbouring pond),certainly,an occasional duck!

As if aware of its peril it now struggles and quacks most vociferously.

2 adverbs to describe how to  quack  - Adverbs for  quack