Simperingly
/ˈsɪmpərɪŋli/
Definition 1 of 1
Pro Tip 1/3Emotional Ambiance
Conveys a negative ambiance; shows someone trying too hard to please in a saccharine or affected way. 
Her simperingly sweet voice made the crowd uncomfortable.
Pro Tip 2/3Excessive Flattery
Used to describe behavior that is excessively flattering, which can be off-putting or insincere. 
He complimented her simperingly, but she saw through his facade.
Pro Tip 3/3Slight Irritation
Often indicates the speaker's irritation with the person acting in a simperingly manner. 
She acted simperingly around the manager, which irked her coworkers.