in·an·i·ty Pronunciation Key - Show Spelled Pronunciation[i-nan-i-tee]
–noun, plural -ties for 2. 1. lack of sense, significance, or ideas; silliness.
2. something inane.
3. shallowness; superficiality.
in·ane Pronunciation Key - Show Spelled Pronunciation[i-neyn]
–adjective 1. lacking sense, significance, or ideas; silly: inane questions.
2. empty; void.
–noun 3. something that is empty or void, esp. the void of infinite space
But if you prefer insanity, I can go with that too. See? You learned a new word today. Don't wear it out.