timid, demure, overmodest, modest, indefinite, coyish, bashful, sheep-faced, shamefaced, blate, more...

bold, forward, confident, assertive, outgoing

little, old, new, 4th, bright, 5th, 6th, present, monstrous, 1st, vain

flirtatiously shy,   affectedly shy,   affectedly modest,   playfully shy,   playfully secretive,   played hard to get,   slyly shy,   calm but flirty,   bashful flirty,   flirty voice