A faceless person or thing doesn't have any distinct features that make them stand out.
When we talk about something being faceless, it usually means that we can't identify who or what it is because there's no clear sign of personality or individuality. For example, if you're watching a news report and someone mentions a company but refuses to name the person in charge, they might say "the CEO remains faceless" - this means that their identity hasn't been revealed. In another context, people often talk about anonymous online profiles being faceless because the users don't reveal any personal information or show distinct personalities.
(literally) Having no face.
