indistinct

This word describes a failure of definition, where the edges of an object or the boundaries of a sound bleed into the surroundings. It evokes a sense of blurriness or muffled quality, suggesting that while something is present, it cannot be isolated or identified with certainty. While "vague" often refers to a lack of detail in an idea or a promise, "indistinct" is more frequently tied to sensory perception. It captures the physical frustration of trying to focus on a smudge in a photograph or straining to hear a voice through a thick wall.