Resounding means ringing loudly, or emphatic and beyond dispute. A resounding victory, a resounding no, resounding success.
The figurative sense is much the commoner and means the result left no doubt, which is why a resounding defeat is as usable as a resounding win. The literal sense is a sound filling a space.
1adjectiveresoundingRinging loudly, or emphatic and beyond dispute.
“The school play was a resounding success, and every seat was full.”
resounding is a quality.
From resound + -ing.
Etymology from Wiktionary, CC BY-SA