Eng: Earnest...

懇

Beg, Beseech, Cordial, Earnest, Entreat, Sincere

諄

Earnest, Patient, Repeatedly

踏實

Earnest, Steady, Sure

懇切

Earnest, Sincere

認真

Attentive, Attentively, Earnest, Earnestly, Serious, Seriously

諄諄

Earnest, Patient

切實

Certain, Earnest, Real, Strict, Sure, Thorough