sixthly

This term is used exclusively as an ordinal adverb to sequence a list of points or arguments. It is most common in highly formal, academic, or legal writing where a rigorous, numbered structure is required to ensure clarity and precision.

In modern conversational English and standard business correspondence, "sixthly" is rarely used because it can feel overly stiff or pedantic. Writers typically prefer using bullet points or phrases such as "the sixth point is" or "sixth" to avoid the perceived formality of the "-ly" suffix in ordinal sequences.