What is another word for full of hot air?
Pronunciation: [fˈʊl ɒv hˈɒt ˈe͡ə] (IPA) 
When someone talks a lot without actually saying anything, they could be described with the phrase "full of hot air." However, there are several other synonyms that could also apply. For example, someone who is all talk and no substance could be called a blabbermouth or a windbag. They could also be referred to as boastful or grandiloquent, meaning their speech is ostentatious or grandiose but lacking in substance. Another option could be to describe them as garrulous or loquacious, indicating they talk excessively but with little real content. Regardless of the specific term used, it's clear that someone who is "full of hot air" tends to do a lot of talking without any real value.
