demoralize
🇺🇸
/dɪˈmɔːrəlaɪz/
🇬🇧
/dɪˈmɒrəlaɪz/
to cause someone to feel less confident or hopeful
The constant criticism from the boss demoralized the new employees.
上司の絶えずの批判は新しい社員の士気をくじかせた。