perceptible in WordNet English dictionary

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