3. Modest, demure, prudish imply conformity to propriety and decorum, and a distaste for anything coarse or loud. Modest implies a becoming shyness, sobriety, and proper behavior: a modest, self-respecting person. Demure implies a bashful, quiet simplicity, staidness, and decorum; but can also indicate an assumed or affected modesty: a demure young chorus girl. Prudish suggests an exaggeratedly self-conscious modesty or propriety in behavior or conversation of one who wishes to be thought of as easily shocked and who often is intolerant: a prudish objection to a harmless remark.

Did you mean immodest?