Sheerly is an adverb used to describe something in an absolute or pure manner. Synonyms for sheerly include purely, wholly, completely, utterly, entirely, totally, fully, thoroughly, absolutely, and downright. These words convey a sense of completeness and are often used to emphasise the degree of something. For instance, "sheerly breathtaking" could be replaced with "utterly breathtaking" or "completely breathtaking." Depending on the context and formality of the writing, different synonyms for sheerly may be more appropriate. However, all of these words signify an intensity and emphasis on the quality of the described object or idea.