IPA: /ˌɔːrnəˈmɛntəli/
KK: /ɔrnəˈmɛntəli/
In a way that is decorative or intended to make something look more attractive.
The room was ornamentally decorated with beautiful paintings and sculptures.
Ornamentally → It is formed from "ornament" (from Latin "ornamentum", meaning an embellishment or decoration) and the suffix "-ally" (meaning in a manner of). The word "ornamentally" means in a manner that relates to decoration or embellishment.
Think of 'ornament' as something that adds beauty or decoration, and remember that 'ornamentally' means doing something in a decorative way.