Someone who talks far too much, especially someone who talks at length and importantly while saying very little of substance. The picture inside the word is a bag full of air: plenty of puff, no weight. This is an insult, and not a gentle one, but it is an old-fashioned, almost comic sort of insult — the kind of word an irritated older person uses about a politician, a preacher, a manager, or an uncle who has trapped everyone at the dinner table. It is not obscene and would not shock anyone, but you would never say it to the person's face in a formal setting. Note what it does and does not mean. It is not simply 'chatty' or 'sociable' — a friend who talks a lot happily is not a windbag. The word carries the extra idea that the person believes their own speech is important, and that everyone else is waiting for them to stop. That is why it attaches so naturally to public speakers. The word 'wind' here means air, and there is a hint of the older sense of 'wind' as empty talk, as in 'that report is just wind'. Note the pronunciation: 'wind' as in air, /wɪnd/, not 'wind' as in wind a clock. It is a countable noun — a windbag, two windbags — and there is an adjective 'windy' that can mean long-winded in the same way, though 'long-winded' is the safer, more common way to say that a speech went on too long.

話多的人、長舌公、廢話連篇的人（帶貶意）