Frankest

adjective

1. Honest, especially in a manner that seems slightly blunt; candid; not reserved or disguised.

   "May I be frank with you?"

2. Unmistakable, clinically obvious, self-evident

   "The research probes whether treating pre-diabetes with metformin can prevent progression to frank diabetes."

3. Unbounded by restrictions, limitations, etc.; free.
4. Liberal; generous; profuse.
5. Unrestrained; loose; licentious.