Inane definition is - lacking significance, meaning, or point: silly. How to use inane in a sentence. Can inane Be Used As a Noun? Some common synonyms of inane are banal, flat, insipid, jejune, and vapid. While all these words mean "devoid of qualities that make for spirit and character,". Inane definition, lacking sense, significance, or ideas; silly: inane questions. See more. If something is inane, it's silly or senseless. If you just want to space out, you won't mind the inane chatter on TV, as long as it's on. If you describe someone's behaviour or actions as inane, you think they are very silly or stupid. He always had this inane grin. She started asking me inane. inane | American Dictionary extremely silly or lacking real meaning or importance: There are so many inane programs on television! Translations in context of "inane" in English-Russian from Reverso Context: Now that I'm finally minutes away, I get summoned to the most inane family. Definition of INANE (adjective): completely stupid. Definition of inane adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes. Inane meaning Frequency: Lacking sense or meaning; foolish; silly. The definition of inane is someone or something that is dumb, pointless, silly or stupid.