至急

zhìjí
  1. (literary) extremely urgent
  2. extremely urgent

Wiktionary

Entry Composition

=1 至 zhì
  1. to arrive
  2. most
  3. to
  4. until
=1 至 dié only used in 單至／单至
2 急 jí
  1. urgent
  2. pressing
  3. rapid
  4. hurried
  5. worried
  6. to make (sb) anxious