Expressions Of Insincerity

noun a show, pretense, or display of manners, feelings, or beliefs that are not genuine or natural

• Her affectation of wealth was evident in the way she flaunted expensive designer clothes.
• Stop with the affectation of sophistication, just be yourself.
• Her affectation of being cool is so annoying, she's just trying too hard.
• His constant affectation of happiness masked the pain he was truly feeling inside.

adjective showing or feeling little enthusiasm

• The committee was disappointed by the halfhearted effort put forth by the team.
• I could tell she was only giving a halfhearted attempt at cleaning her room.
• Don't be so halfhearted about it, just give it your all!
• His halfhearted apology did little to mend the broken relationship.