a forced smile

Translations
натянутая улыбка
She greeted him with a forced smile.
Она поприветствовала его натянутой улыбкой.
Definitions
A forced smile is a smile that is not genuine or spontaneous, often created to mask true feelings or emotions, such as discomfort, sadness, or discontent. It may be used in social situations to conform to social norms or expectations, despite the individual's true emotional state.
Words
a

article or possessive pronoun
неопределённый артикль
forced

adjective
вынужденная
smile

noun
улыбка