a loud bombastic declamation expressed with strong emotion
source: WordNet 3.0
pompous or pretentious talk or writing
source: WordNet 3.0
High-sounding language, without importance or dignity of thought; boisterous, empty declamation; bombast; as, the rant of fanatics.
source: Webster 1913
verb
talk in a noisy, excited, or declamatory manner
source: WordNet 3.0
To rave in violent, high-sounding, or extravagant language, without dignity of thought; to be noisy, boisterous, and bombastic in talk or declamation; as, a ranting preacher.