Integrity

The quality of being honest and having strong moral principles; moral uprightness.

Synonyms:

Honesty, probity, rectitude, honor, good character, principle, ethics, morals, righteousness, morality, virtue, decency, fairness, scrupulousness, sincerity, truthfulness, trustworthiness

Examples:

Ally’s integrity was never in question when asked to tell the truth.   

The young boy showed integrity when he returned a lost wallet to the owner.