perceptible -- (capable of being perceived by the mind or senses; "a perceptible limp"; "easily perceptible sounds"; "perceptible changes in behavior")
perceptible -- (easily perceived by the senses or grasped by the mind; "a perceptible sense of expectation in the court")
detectable, perceptible -- (easily seen or detected; "a detectable note of sarcasm"; "he continued after a perceptible pause")