behaviour or an action that is not natural or sincere and that is often intended to impress other people (Oxford)
behaviour or speech that is not sincere (Cambridge)
His little affectations irritated her. (Oxford)
He speaks clearly and without affectation. (Oxford)
His manner reeks of affectation. (Cambridge)
irritated by affectations
speaks without affectation
Artificiality
Insincerity
Honesty
Truth
Affectation