Inane means empty of sense or meaning. Words that fill the air and say nothing.
It is a criticism and a fairly withering one, since calling a question inane means it was not worth asking. It attaches to remarks, grins, chatter and questions. An inane grin is one with nothing behind it. The word is a shade more contemptuous than silly and a good deal more so than pointless. The noun inanity means both the quality and an individual empty remark.
1adjectiveinaneSilly and completely lacking in sense.
“He asked one inane question after another.”
Latin
inānis — empty, vain, useless
English, today
inane
From Latin inānis (“empty, vain, useless”), of unknown origin.
Etymology from Wiktionary, CC BY-SA