A (認真) 认真 ren4zhen1 
conscientious/ earnest/ serious 
gewissenhaft,ernsthaft B (嚴肅) 严肃 yan2su4
serious/ solemn/ earnest/ enforce
ernst, ernsthaft, feierlich D (真心) 真心 zhen1xin1
sincere/ wholehearted
ernsthaft D (一頭) 一头 yi1tou2
wholeheartedly
ernsthaft, rückhaltlos, mit ganzem Herzen, voll und ganz
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一 一 one / a, an / alone
頭 头 head / top / chief, first / boss
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D (真心) 真心 zhen1xin1 sincere/ wholehearted ernsthaft