the GNU version of the Collaborative International Dictionary of English
a. & n. from simper, v.
The Century Dictionary and Cyclopedia
Wearing or accompanied by a simper; hence, affected; silly.
Word Usage
""Ah!" sighed Celeste, who prided herself on her delicacy, "I never could eat more than would satisfy a mouse, and since my engagement," simpering, "I cannot swallow enough to scarce keep me alive!""