mask (someone's) feelings

Translations
скрывать (чьи-то) чувства
He tried to mask his feelings of disappointment.
Он пытался скрыть свои чувства разочарования.
Definitions
To conceal or hide someone's true emotions or feelings, often to protect them or to avoid revealing vulnerability.
Words
feeling

noun
чувство
mask

verb
маскировать