他雖然擺着一副若無其事的樣子，但是我想他心裏一定擔心得不得了。

He'll never show it, but I think that deep down, he's seriously worried.

Source: Tatoeba

Sentence Composition

1 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
2 雖然 suīrán although; even though (often used correlatively with 可是 kěshì or 但是 dànshì etc)
3 擺 bǎi
  1. to arrange
  2. to exhibit
  3. to move to and fro
  4. a pendulum
=4 着 zhāo
  1. a move in chess (Taiwan pr. zhuó)
  2. trick; tactic
  3. (dialect) okay; all right
  4. (dialect) to put in; to add
=4 着 zháo
  1. to touch
  2. to come in contact with
  3. to feel
  4. to be affected by
  5. to catch fire
  6. to burn
  7. (coll.) to fall asleep
  8. (after a verb) hitting the mark
  9. succeeding in
=4 着 zhe aspect particle indicating action in progress or ongoing state
=4 着 zhuó
  1. to wear (clothes)
  2. to contact
  3. to use
  4. to apply
5 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
6 副 fù
  1. secondary
  2. auxiliary
  3. deputy
  4. assistant
  5. vice-
  6. abbr. for 副詞 adverb
  7. classifier for pairs, sets of things & facial expressions
7 若無其事 ruòwúqíshì (idiom) as if nothing had happened; calm and composed; nonchalant
=8 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂兒的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=8 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=8 的 dí really and truly
=8 的 dì (bound form) bull's-eye; target
9 樣子 yàngzi
  1. appearance
  2. manner
  3. pattern
  4. model
10 但是 dànshì but; however
11 我 wǒ
  1. I
  2. me
  3. my
12 想 xiǎng
  1. to think (about)
  2. to think of; to devise
  3. to think (that); to believe (that)
  4. to desire; to want (to)
  5. to miss (feel wistful about the absence of)
13 他心 tāxīn
  1. (literary) ulterior motives
  2. ulterior motives
14 裏 lǐ variant of 裡 lǐ
15 一定 yīdìng
  1. surely
  2. certainly
  3. necessarily
  4. fixed
  5. a certain (extent etc)
  6. given
  7. particular
  8. must
16 擔心 dānxīn
  1. anxious
  2. worried
  3. uneasy
  4. to worry
  5. to be anxious
=17 得 dé
  1. to obtain
  2. to get
  3. to gain
  4. to catch (a disease)
  5. proper
  6. suitable
  7. proud
  8. contented
  9. to allow
  10. to permit
  11. ready
  12. finished
=17 得 dè used in 得瑟 dèse
=17 得 de structural particle: used after a verb (or adjective as main verb), linking it to following phrase indicating effect, degree, possibility etc
=17 得 děi
  1. to have to
  2. must
  3. ought to
  4. to need to
18 不得了 bùdéliǎo
  1. desperately serious
  2. disastrous
  3. extremely
  4. exceedingly