1. Marks, signs, or impressions that are so similar or unclear that they cannot be easily differentiated or told apart from one another
The two signatures were indistinguishable marks on the document, making it impossible to verify authenticity.
As duas assinaturas eram marcas indistinguíveis no documento, tornando impossível verificar a autenticidade.
2. In forensic or technical contexts, impressions or traces that lack sufficient distinctive features for identification or comparison
The footprints left at the crime scene were indistinguishable marks in the mud.
As pegadas deixadas no local do crime eram marcas indistinguíveis na lama.