Chinese words starting with 笃 (dǔ) 笃 dictionary entry 13 words. 笃(dǔ)信(xìn) to sincerely believe 笃(dǔ)定(dìng) certain 笃(dǔ)实(shí) loyal 笃(dǔ)志(zhì) steadfast 笃(dǔ)信(xìn)好(hào)学(xué) sincere belief and diligent study 笃(dǔ)厚(hòu) honest and generous 笃(dǔ)学(xué) studious 笃(dǔ)守(shǒu) to comply faithfully 笃(dǔ)爱(ài) to love deeply 笃(dǔ)行(xíng) to carry out (obligation) conscientiously 笃(dǔ)专(zhuān) with undivided attention 笃(dǔ)挚(zhì) sincere 笃(dǔ)病(bìng) seriously ill