unassuming

1. ADJ If you describe a person or their behaviour as unassuming, you approve of them because they are quiet and do not try to appear important. 不装腔作势的; 谦逊安静的[表赞许]

He's a man of few words, very polite and unassuming. 他不爱说话，非常有礼貌，也不装腔作势。