1. An indistinct or blurred outline of a person or object, seen against light or in dim conditions, with unclear details
In the fog, we could only see the vague silhouette of the building.
Na neblina, podíamos ver apenas a silhueta vaga do edifício.
2. A shadowy or obscure shape that lacks precise definition or clear boundaries
The vague silhouette of a figure appeared at the end of the hallway.
A silhueta vaga de uma figura apareceu no final do corredor.