If you are 'above reproach' or 'beyond' reproach you are not deserving of criticism or blame, usually due to exemplary behaviour or actions. To be 'beyond reproach' means to behave in an honourable way. This is an expression that is often used in formal contexts.

1. Peter's character is beyond reproach. I would trust him with my life.
2. The pensioner behaved beyond reproach in helping his fellow citizen in a time of need and is due to receive an award for his brave actions.

1. Negotiations went very smoothly. The behaviour of the other party was above reproach throughout.
2. Luke is too controversial a character to be promoted to such an elevated position. The person chosen for that role should be above reproach.