矢志不渝

shǐzhìbùyú

unwavering; unshaken; persistent; steadfast; unswerving

Wiktionary

Entry Composition

=1 矢志 shǐzhì
  1. to take an oath to do sth
  2. to pledge
  3. to vow
=1 矢志 shǐzhì to pledge one's devotion to a cause
2 不渝 bùyú
  1. constant
  2. unchanging
  3. abiding
  4. faithful