Abu Sa'eed Khudari Radiyallahu 'Anhu says that Rasulullah Sallallahu 'Alayhi Wasallam was more bashful than a virgin girl in her veil (purdah). When Rasulullah Sallallahu 'Alayhi Wasallam did not like something, it could be seen on his face. (Because of his excessive Modesty he did not mention it).
English reference: Book 48, Hadith 341
Arabic reference: Book 49, Hadith 358