1. A faint, unclear, or hard-to-discern sign or mark left behind by something; an indistinct remainder or evidence of something past
The archaeologists found only obscure traces of the ancient civilization.
Os arqueólogos encontraram apenas vestígios obscuros da civilização antiga.
2. Something barely perceptible or difficult to understand; a vague hint or impression
There remained an obscure trace of doubt in his mind.
Permanecia um vestígio obscuro de dúvida em sua mente.