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notion
have half a notion to do something
and have half a mind to do somethingFig. to have almost decided to do something, especially something unpleasant. I have half a mind to go off and leave you here. The cook had half a notion to serve cold chicken.
not have the foggiest notion
to not know anything at all about something not have the faintest idea I don't have the foggiest notion what that book is about.