invisible enemy

Translations
невидимый враг
The virus is an invisible enemy that we must fight.
Вирус — это невидимый враг, с которым мы должны бороться.
Definitions
An invisible enemy refers to a threat or adversary that cannot be seen or easily identified, often used in contexts such as disease, psychological challenges, or abstract concepts like fear or doubt.
Words
invisible

adjective
невидимый
enemy

noun
враг