Primitively

1. (adv.) Originally; at first.

2. (adv.) Primarily; not derivatively.

3. (adv.) According to the original rule or ancient practice; in the ancient style.

Thesaurus Entries

ab initio, ab ovo, aborigine, at first, at the start, before everything, chiefly, first, first and foremost, first thing, firstly, from the beginning, in the beginning, mainly, originally, primarily, primitively, primo, principally