Hey There!!
I think the answer to this is: The 3 one is. A Relative. The 4 one is. A noun. And, The last one is. adverbial.
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It means to be silly or stupid.
Ex. "Don't constantly badger people with inane questions."
It seems that this question is lacking information. Is there an image that should be attached with it?
A soliloquy is like when an actor is speaking to themselves mostly relating thoughts or feelings, which is done to give off an illusion of unspoken reflections.