This is the 18419th most frequent Russian word.
эмоционального
"Emotional."
In this sentence, 'эмоционального' is used as an adjective describing the noun 'выражения' (expression), indicating that the expression is characterized by emotions.
Он ищет способ эмоционального выражения своих мыслей.
He is looking for a way of emotional expressing of his thoughts.
Here, 'эмоционального' modifies 'состояния' (state), pointing to the mental and emotional conditions experienced by the artist.
Мы провели вечер в обсуждении эмоционального состояния артиста.
We spent the evening discussing the artist's emotional state.
In this usage, 'эмоционального' refers to the adjective describing the noun 'напряжения' (tension), specifying that the tension pertains to emotions or emotional stress.