tergiversator

You have given me much valued information and much food for thought-but "tergiversator" I especially prize, even if it is a small point.

Like the present Lucius Marcius Philippus's grandfather, he was a born tergiversator, saw no disgrace in changing sides whenever instinct prompted it.

When the Great Tergiversator rises in this House to deliver one of his magnificently worded and delivered speeches, rest assured there is always a hidden motive!