- The definition of fatuous is foolish or silly.
An example of fatuous is the nature of a clown.
This man is fatuous.
fatuous definition by Webster's New World
- complacently stupid or inane; silly; foolish
- Archaic like an ignis fatuus; illusory; unreal
Origin: Classical Latin fatuus, foolish ; from Indo-European base an unverified form bhāt-, to strike from source batter
fatuous definition by American Heritage Dictionary
Origin: From Latin fatuus.
- fatˈu·ous·ly adverb
- fatˈu·ous·ness noun