Definitions

1. adjective

excessively or annoyingly self-important, pretentious, or foolishly talkative.

“Her fatuous comments at the meeting annoyed everyone.”

2. noun

a foolish or absurd idea.

“The entire plan was a fatuous scheme to deceive the public.”

3. noun

an excessively or annoyingly self-important or pretentious person.

“He’s become a fatuous bore, always talking about himself.”