DictionarybombastPompous language
noun

bombast

BAHM-bast/ˈbɑːmbæst/

Speech or writing that sounds grand but has little substance.

The speech offers plenty of bombast but almost no practical detail.

An ordinary committee meeting overwhelmed by a speaker's pompous, theatrical oratory: sweeping declarations and self-important delivery are visibly out of proportion to the modest discussion and listeners' reactions.
Etymology

Cotton used as stuffing or padding supplied the image behind bombast. Language that swells with grand expressions but adds little substance is figuratively padded out.

In context

ThinkTech Hawaii4:24
… mere bombast fraud deception impiety and hypocrisy a thin wall to cover up crimes …
'The Meaning of July Fourth for the Negro' by Frederick Douglass (Navigating The Journey)

More examples

  • She cut the bombast from the draft.
  • His grand promises sounded like empty bombast.
  • The critic disliked the novel's political bombast.

Similar words

grandiloquence
An elevated style that need not be wholly empty.
bluster
Loud or threatening talk rather than elaborate rhetorical inflation.