"thudding" in the verb sense
1. thud, thump
make a dull sound
"the knocker thudded against the front door"
2. thud
strike with a dull sound
"Bullets were thudding against the wall"
3. crump, thud, scrunch
make a noise typical of an engine lacking lubricants
"thudding" in the adjective sense
1. dull, thudding
not clear and resonant sounding as if striking with or against something relatively soft
"the dull thud"
"thudding bullets"
Source: WordNet® (An amazing lexical database of English)
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