We don't have synonyms for iniane yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are insane, inane and niniane.
"This supremely gifted kid told me that in the early elementary grades, the songs sung in music class were so inane that he wanted to skip grades already! Eventually he did, so better late than never."
"This supremely gifted kid told me that in the early elementary grades, the songs sung in music class were so inane that he wanted to skip grades already! Eventually he did, so better late than never."