coyest

kɔɪ

adjective

(especially with reference to a woman) making a pretence of shyness or modesty which is intended to be alluring.

she treated him to a coy smile of invitation

arch,simpering,coquettish,flirtatious,kittenish,skittish,shy,modest,bashful,reticent,diffident,retiring,backward,self-effacing,shrinking,withdrawn,timid,demure