perceptible

adj

1. Able to be perceived, sensed, or discerned.

   “Her voice was barely perceptible over the noise, but her gestures made her meaning clear.”

   “Sunning himself on the board steps, I saw for the first time Mr. Farquhar Fenelon Cooke.[…]A silver snaffle on a heavy leather watch guard which connected the pockets of his corduroy waistcoat, together with a huge gold stirrup in his Ascot tie, sufficiently proclaimed his tastes.[…]But withal there was a perceptible acumen about the man which was puzzling in the extreme.”

noun

1. Anything that can be perceived.