ornamentation C2+

/ˌɔrnəmɛnˈteɪʃən/ decorative details added to something for adornment

inornate C2+

/ˌɪnɔrˈneɪt/ plain and unadorned; without ornament

unadorned C2+

/ˌʌnəˈdɔːrnd/ plain; not decorated or embellished

ornateness C2+

/ɔrˈneɪtnəs/ the quality of being elaborately or excessively decorated