(w)

(dǔ) serious (illness); sincere; true

笃信 (w)

(dǔxìn) to believe firmly; devout in one's faith

笃信好学 (w)

(dǔxìnhàoxué) sincere belief and diligent study

笃厚 (w)

(dǔhòu) honest and generous; magnanimous

笃学 (w)

(dǔxué) studious; diligent in study

笃守 (w)

(dǔshǒu) to comply faithfully; sincerely abiding by

笃定 (w)

(dǔdìng) certain; confident (of some outcome); calm and unhurried

笃实 (w)

(dǔshí) loyal; sincere; sound

笃专 (w)

(dǔzhuān) with undivided attention

笃志 (w)

(dǔzhì) steadfast; with single-minded devotion

笃爱 (w)

(dǔài) to love deeply; devoted to sb

笃挚 (w)

(dǔzhì) sincere (in friendship); cordial

笃病 (w)

(dǔbìng) seriously ill; critical

笃行 (w)

(dǔxíng) to carry out (obligation) conscientiously; to behave sincerely