(/ˈsɪm pər/)

1. To smile in a foolish, frivolous, self-conscious, coy, or smug manner.

… You have to go on the record.’ My arms were going crazy. I was so angry and so frustrated. All the time he was wasting. All his lies. And he was simpering.” Finally something in Jonah’s voice made Michael know that it was going to happen. “So I ran into Duane Reade, and I bought a fucking Hello Kitty notebook and a pen, and in twenty-five seconds, he said, ‘I panicked. And I’m deeply sorry for lying.’”

From the post: Vocabulary Words from ‘So You’ve Been Publicly Shamed’
Source: So You’ve Been Publicly Shamed, by Jon Ronson (