hardened attitude

Translations
ожесточенное отношение
Their hardened attitude made negotiations difficult.
Их ожесточенное отношение затруднило переговоры.
Definitions
A hardened attitude refers to a mindset that is resistant to change, often characterized by a lack of empathy, openness, or willingness to consider alternative perspectives. It typically results from past experiences or disappointments that have led an individual to become cynical or defensive.
Words
attitude

noun
отношение
hardened

adjective
закалённый