Saucily
/ˈsɔːsɪli/
Definition 1 of 1
Pro Tip 1/3Playful Rudeness
Used to describe sassy behavior that's disrespectful but not meant to be hurtful. 
He saucily quipped that he could cook better than the chef.
Pro Tip 2/3Conversation Spice
'Saucily' adds a lively, piquant flavor to dialogue, implying a touch of mischief or daring. 
She saucily retorted, 'Why, jealous?'
Pro Tip 3/3Friendly Teasing
Appropriate in casual, friendly exchanges where teasing is welcome and understood. 
He saucily asked her for a dance, with a playful wink.