Very retiring and gentlemanly he was. Even his voice was gentle. He'd had the quinsy and swollen glands when he was young, he told me, and it had left him with a weak throat, and a hesitating, whispering fashion of speech.〔【出典】英文："A Case of Identity" by Arthur Conan Doyle、訳者：大久保ゆう〕"_CO-IDEN", "2550155"
She has also discovered some similarities in Nepalese and Japanese customs and behavior, as well as language: Japan's Coming of Age Day （January 15）, for example, can be likened to the Nepalese tradition of celebrating a girl's first menstruation as her "coming of age," and some mannerisms are also common to Japanese and Nepalese women, such as covering the mouth when laughing, as well as general shyness and "not speaking unless spoken to."〔【出典】Hiragana Times, 1997年5月号◆【出版社】株式会社ヤック企画 〕"HT127007", "2443225"
The former would be just too shy to take any action regarding loving or dating, and the latter would just be too insensitive and boring.〔【出典】Hiragana Times, 1998年9月号◆【出版社】株式会社ヤック企画 〕"HT143010", "2486056"
And having found her a husband, rich, young, and noble, such as the proudest maid in Verona might joyfully accept, he could not bear that out of an affected coyness, as he construed her denial, she should oppose obstacles to her own good fortune.〔【出典】日英対訳文・対応付けデータ（独立行政法人情報通信研究機構）〕"_ROMEO2", "2248117"
be shy outside one's own territory
be a bit shy
be a little shy
It strikes me that he is quite retiring and cautious, and a little bit sensitive and nervous.