Old fashioned words that make you sound smart and are also ridiculously fun to say.
Be that as it may: an idiom used to politely dismiss someone else's point as irrelevant — a way of saying "that may be true, but it changes nothing" without the confrontation of saying so directly.
You've heard the argument. You've considered the evidence. You have, in fact, taken it all under advisement. Your position remains unchanged, and you'd like it noted that you arrived at that unchanged position through careful consideration, not stubbornness.
