"Five o'clock shadow" is a term commonly used to describe the scruffy appearance of facial hair that grows back after an incomplete shave. However, this term is not the only way to describe this look. A few other synonyms or related terms used for the five o'clock shadow are "stubble," "scruff," "shadow beard," "whiskers," "beard shadow," "rough beard," and "day-old beard." All these terms are used to describe the same thing - that rugged facial hair growth that gives off the appearance of a bit of unkemptness. Each of these terms has become popular in their own right, and people nowadays employ different terms to describe the same thing.