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For example this month to date I have several keywords with CTRs ranging from 4-25% but 0 conversions.
At what point do you consider it a KW that doesn't convert well for your campaign?
I suppose the next logical move would be to lower the bids, and possibly adjust the landing pages but that can require significant time so the question becomes is this KW that hasn't converted worth all the time ($$) required to possibly squeeze something out of it? Hmm.
Additionally are you sure that this keyword isn't forming part of your buying cycle, if people in the research phase search for widgets and people in the buying stage search for red widgets, you will never see any conversions for the term widgets, but if you stop bidding on it you will lose sales.