殷勤

politely / solicitously / eagerly attentive

surname Yin / dynasty name at the end the Shang dynasty, after their move to Yinxu 殷墟 in modern Henan province

dark red

flourishing / abundant / earnest / hospitable

roll of thunder

diligent / industrious / hardworking / frequent / regular / constant

variant of 勤[qin2] / industrious / solicitous

to be particularly attentive to (an attractive young lady or man etc) / to fawn upon (an influential politician etc) / to court sb's favor / to ingratiate oneself

one who is unaccountably solicitous is hiding evil intentions (idiom)