* His arguments were so vacuous that I couldn't even follow his line of reasoning. (Meaning: The arguments were empty of meaning or substance.)
* The celebrity's interview was filled with vacuous pronouncements about fame and fortune. (Meaning: The pronouncements lacked depth or intelligence.)
* The novel's characters were so vacuous that they felt like cardboard cutouts. (Meaning: The characters were shallow and lacked any real personality.)
* She spent her days engaged in vacuous activities, watching endless hours of reality television. (Meaning: The activities were pointless and lacked any intellectual stimulation.)
* The politician's speech was a vacuous attempt to appeal to the masses. (Meaning: The speech lacked any real substance or meaningful ideas.)