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пустомеля n stresses
gen.	bladder; chatterbox; gabber; haverel; rattle-box; rattle-brain; windjammer; bagpipe; rattle-pate; all talk and no trousers (WiseSnake); all mouth and no trousers (WiseSnake); all hype and no trousers (WiseSnake); twaddler (Anglophile); ringer (alloptimistic); rattle head; garrulous (Баян); babbler; blabber; cackler; ranter; an idle tale teller; tattler; trifler; gasser
Gruzovik	bletherer
Игорь Миг	swaggerer; talker
contempt.	ranter (об ораторе); windbag
derog.	ranter (об ораторе и т.п.)
disappr.	paper asshole (PanKotskiy); man with a paper asshole (PanKotskiy)
fig.	hot air balloon (VLZ_58)
humor.	sand beggar (US alloptimistic); beggar (alloptimistic)
hunt., fig.	babbling
inf.	rattle; rattletrap; rattler; big gob (Ivan Gribanov); quitter (schnuller); drivelling idiot (Br. Andrey Truhachev); trash-talker (Aus. Andrey Truhachev); raw-gabbit (archaic Scot. Andrey Truhachev); bullshit artist (SirReal); blabbermouth (VLZ_58); motormouth (VLZ_58); phony (Agasphere)
Makarov.	a bag of wind; bag of wind; rattle-head
nonstand.	clucker
obs.	cotquean; disard; gunster
rude	bullshitter (Andrey Truhachev)
slang	gink; rattlebrain
slang, Makarov.	hot-air artist; hot-air merchant
досл.: "всё болтовня и никаких брюк" пустомеля n
gen.	all talk and no trousers; all mouth and no trousers; all hype and no trousers; all talk and no action
пустомели n
gen.	hobby-horses (Lyubov_Zubritskaya)
пустомелить v
Gruzovik, inf.	talk nonsense
slang	ramble on (VLZ_58); rattle (away/on VLZ_58); chatter (VLZ_58)

пустомеля : 7 phrases in 6 subjects

American usage, not spelling	1
General	2
Idiomatic	1
Informal	1
Rhetoric	1
Rude	1