1) Ethical 2) Moral 3) Scrupulous 1) High-principled 2) Scrupulous 3) Upright in the school office 
• (imp. & p. p.) of Principle
[adj] - based on or manifesting objectively defined standards of rightness or morality
principled Based on, marked by, or manifesting principle: a principled decision; a highly principled person.
adjective based on or manifesting objectively defined standards of rightness or morality; `principled pragmatism and unprincipled expediency`; `a principled person`
imbued with or having moral principles (often used in combination): high-principled.