1. A difficulty or issue that exists but has not been observed, detected, or recognized by anyone
The unnoticed problem with the software led to data loss months later.
O problema despercebido com o software resultou em perda de dados meses depois.
2. An overlooked or hidden issue that may have serious consequences if left unaddressed
The unnoticed problem in the building's foundation eventually caused structural damage.
O problema despercebido na fundação do edifício eventualmente causou danos estruturais.