On only the rarest occasions do philosophers suggest that some term ("good", "morality," "rationalism", "free will", "soul", "knowledge") might not possess a definition that is precise enough to do the work that we ask of it.

And they neve expend any effort in establishing clear meanings for such terms. Oh wait....they expend far too mcuh effort arguing about definitions...no, too little...no, too much.

OK: the problem with philosopher is that they are contradictory.