- Asinine implies the extreme stupidity conventionally attributed to an ass an asinine argument See also syn. study at absurd.
- Fatuous suggests stupidity, inanity, or obtuseness coupled with a smug complacency a fatuous smile
- Stupid implies a slow-wittedness or lack of normal intelligence he is stupid to believe that
- Silly implies ridiculous or irrational behavior that demonstrates a lack of common sense, good judgment, or sobriety it was silly of you to dress so lightly