Thorough

"Complete with regard to every detail; not superficial or partial.  Performed or written with great care and completeness. Taking pains to do something carefully and completely."

Honest

"Free from deceit and untruthfulness; sincere.  Free from fraud or deception.  Marked by integrity."

Persistent

"Continually recurring to the mind. Existing or remaining in the same state for an indefinitely long time; enduring.  Continuing to do something in a determined way."