Tergiversate

–verb (used without object), -sat·ed, -sat·ing.

1.

to change repeatedly one's attitude or opinions with respect to a cause, subject, etc.; equivocate.

2.

to turn renegade.

Pedant

1. One who pays undue attention to book learning and formal rules.
2. One who exhibits one's learning or scholarship ostentatiously.
3. A person who relies too much on academic learning or who is concerned chiefly with insignificant detail.