The Spanish word 'sinvergüenza' (meaning 'shameless person') is a compound word formed from 'sin' (meaning 'without') and 'vergüenza' (meaning 'shame'). The 'vergüenza' part has an interesting Latin origin, tracing back to the Latin verb 'vereri' meaning 'to feel awe or respect'. This evolved into the Latin adjective 'verecundus' meaning 'modest' or 'bashful', which then gave rise to the Latin noun 'verecundia' meaning 'shame' or 'modesty'. The Spanish 'vergüenza' directly inherited this meaning of 'shame' from Latin 'verecundia'. When combined with 'sin' ('without'), the compound word 'sinvergüenza' literally means 'without shame', and is used to refer to a shameless or impudent person.

The most obvious related Spanish word is 'vergüenza' (shame), which is commonly used on its own. You might hear phrases like 'tener vergüenza' (to have shame/to be ashamed) or 'qué vergüenza' (what a shame/how embarrassing). The prefix 'sin-' is also very common in Spanish and is used to create many other words meaning 'without something', such as 'sinsentido' (nonsense, literally 'without sense') or 'sinfín' (endless, literally 'without end').

While English doesn't have any common direct descendants from Latin 'vereri' or 'verecundia', we do have some words that share the meaning of respect and reverence from similar roots. The word 'revere' (to regard with deep respect) comes from a related Latin word 're-vereri'. Similarly, 'reverent' and 'reverence' share this connection to the ancient concept of respect and awe that was present in the Latin 'vereri'.