心無旁騖

心无旁骛
xīnwúpángwù
  1. completely focused
  2. free of distractions

CEDICT

to be concentrated and single-minded

Wiktionary

專心一意而無其他念頭

維基詞典

Entry Composition

1 心 xīn
  1. heart
  2. mind
  3. intention
  4. center
  5. core

classifiers: 顆, 個
2 無 wú
  1. not to have
  2. no
  3. none
  4. not
  5. to lack
  6. un-
  7. -less
3 旁騖 pángwù
  1. to be inattentive
  2. to be distracted by sth