Peccadillo is a noun that refers to a slight offense.
The Spanish word Pecado (pe COD oh) means sin. The addition of the suffix I-L-L-O, which means ‘little’ gives us a word that means ‘small sin.’ From there, peccadillo was directly imported into English.
Aaron may not be concerned about the peccadillos from his past, but they may hurt his chances if he ever runs for office. All those tiny sins have a way of adding up.