Definitions:

1. Describes something in a way that shows a lack of thought, intelligence, or meaningful content. ADVERB
   • The actor delivered his lines vacuously, failing to convey any real emotion.
2. In a vacuous manner. ADVERB
   • The celebrity spoke vacuously, but fans did not care.
3. Often refers to actions or expressions that seem empty or devoid of substance. ADVERB
   • She smiles vacuously, clearly not understanding the joke.

Synonyms:

• absently
• barren
• blankly
• devoid
• emptily
• empty
• expresionlessly
• hollowly
• inanely
• mindlessly
• vacantly