Cambridge nennt Verb und Substantiv "formal" :
noun [ U ]
uk /dɪˈskʌm.fɪ.tʃər/ us /dɪˈskʌm.fɪ.tʃɚ/
an uncomfortable or embarrassed feeling:
She turned away to hide her discomfiture.
To my discomfiture he began whistling loudly.
She was enjoying her opponents' discomfiture as she spoke.
Sensing his discomfiture, I changed the subject.
The report was released on the eve of the election to the great discomfiture of the government.
He hoped that his face did not show the discomfiture he felt. ...
verb [ T ]
uk /dɪˈskʌm.fɪt/ us /dɪˈskʌm.fɪt/
to make someone feel uncomfortable, especially mentally ...