Rudimentarily is an adverb that is often used to describe something that is done or made in a very basic or primitive way. Synonyms for this word include elementarily, fundamentally, primitively, essentially, simply, basically, or austerely. These words are often used interchangeably to describe the same concept or idea. For example, if one were to describe a rudimentarily constructed shelter, they could also say that it is basically or fundamentally constructed. Similarly, if one were to describe an elementarily designed product, they could also say that it is primitively or simply designed. Using synonyms for rudimentarily can help to add variety and depth to one's writing or speech.