"to pretend, to feign" is Притворяться in Russian.
Притворяться means "to pretend, to feign" in English.
Listen to the pronunciationWord #3363 of 4,000 by frequency in Russian — level B2.
Она умеет притворяться спокойной в любой ситуации.
She knows how to pretend to be calm in any situation.