笃定

篤定
dǔdìng
  1. certain
  2. confident (of some outcome)
  3. calm and unhurried

CEDICT

  1. (dialectal) calm; serene
  2. (dialectal) certain
  3. (dialectal) to be certain that; to be confident that
  4. calm; serene
  5. certain
  6. to be certain that; to be confident that

Wiktionary

  1. 确定，有把握。
  2. 安详。

重編國語辭典

Entry Composition

1 笃 dǔ
  1. (bound form) sincere; genuine
  2. (bound form) (of an illness) serious
2 定 dìng
  1. to fix; to set; to make definite
  2. to subscribe to (a newspaper etc); to book (tickets etc); to order (goods etc)
  3. to congeal; to coagulate
  4. (literary) definitely

Related entries

料定 liàodìng
  1. certain
  2. to know for sure
必然 bìrán
  1. inevitable
  2. certain
  3. necessity
他們的相遇是必然的。

Their meeting was inevitable.

Source: Tatoeba

确定 quèdìng
  1. definite
  2. certain
  3. fixed
  4. to fix (on sth)
  5. to determine
  6. to be sure
  7. to ensure
  8. to make certain
  9. to ascertain
  10. to clinch
  11. to recognize
  12. to confirm
  13. OK (on computer dialog box)
你确定吗？

Are you sure?

Are you sure about this?

Source: Tatoeba

大大方方 dàdàfāngfāng
  1. confident
  2. calm
  3. natural
  4. poised