To accept ( these sumptuous gifts ) embarrasses me , but to refuse them would be unmannerly.
却之不恭,受之有愧.
《现代汉英综合大词典》
When she is being irresponsible , she's coquetting not behaving unmannerly.
42.女友不讲理是撒娇而不是撒野.
互联网
Better be unmannerly than troublesome.
情愿有失礼节,不可使人烦恼.
互联网
"resentment flared at such an unmannered intrusion"