Short answers, pulled from the story.
Apatrapya is a Sanskrit Buddhist term translated as "decorum," "shame," "consideration," or "propriety." It refers to the mental factor of shunning unwholesome actions in order to avoid being reproached by others of good character. It is listed among the virtuous mental factors in Abhidharma teachings.
Hri is the mental factor of self-respect, which leads a person to refrain from unwholesome actions out of their own conscience. Apatrapya, by contrast, motivates the same restraint through concern about being reproached by others of good character. Both are classified as virtuous mental factors in Abhidharma analysis.
The Abhidharma-samuccaya defines apatrapya as the impulse "to avoid what is objectionable in the eyes of others." The text treats social accountability as a genuine virtuous force rather than a lesser form of moral motivation.
The Pali equivalent of apatrapya is ottappa. The Tibetan equivalent in Wylie transliteration is khrel yod pa. Both terms carry the same core meaning of avoiding morally objectionable conduct out of regard for the judgment of others.
Erik Pema Kunsang translates apatrapya as "shame." Other translators, including Guenther and the Rangjung Yeshe Wiki, prefer "decorum," while the Rangjung Yeshe Wiki also offers "consideration" and "propriety" as alternative renderings.
Apatrapya is classified as a virtuous mental factor within Abhidharma teachings. It is understood to arise in a wholesome mind and to support further wholesome action by motivating a person to avoid conduct that would be reproached by others of good character.