all hat and no cowboy
blether
speech is silver, silence is golden
full of hot air
overspeak
drone on
drone
talk someone's head off
talk someone's arm off
talk the legs off a pot
garrulous
talk the hind leg off a donkey
like the sound of one's own voice
talk the leg off the Lamb of God
underspeak
chopse
walaʻau
cackle
overdiscuss
blow out one's bags
talk someone under the table
talkily
pratingly
narrative
egotism
rigmarole
windbag
quiet
vaniloquent
yabble
chaffer
lalophobia
blabbermouth
double-tongued
nontalkative
bark
gas
raving
talkaholism
dyslalia
spraff
bleat