[noun] [disapproving]She has so many little affectations (= ways of speaking and behaving that are not natural to her). [C]His manner reeks of falseness and affectation. [U]"It doesn't concern me," he said with an affectation of (= pretending) nonchalance.
AFFECTATION
Meaning of AFFECTATION in English
Cambridge English vocab. Кембриджский английский словарь. 2012