What characteristic defines neatly trimmed mustaches?

Neatly trimmed mustaches are characterized by being tapered and tidy. This means that they are well-maintained, with the ends being intentionally shaped to create a clean appearance. A tapered mustache gradually narrows towards the ends, which contributes to a polished look, exemplifying attention to grooming and style. The tidy aspect highlights that there are no stray hairs or irregular growth, making the mustache appear sharp and refined. This level of grooming is often associated with personal grooming standards in various military and professional settings, where maintaining a neat appearance is important.