Bombastic
/bɒmˈbæs.tɪk/ adjective mediumUsing inflated, showy language that sounds impressive but says little.
The politician's bombastic speech was full of grand promises but conspicuously short on actual policy details.
Memory Trick
Think of a dud bomb — bombastic language explodes with big, loud words yet, like a bomb that fails to detonate, leaves little real substance behind.