1) Audible 2) Detectable 3) Discernible 4) Easily seen or detected 5) Faint 6) Hearable 7) Noticeable 8) Palpable 9) Perceivable 10) Recognizable 11) Seeable 12) Sensible 13) Visible 1) Audible 2) Detectable 3) Faint 4) Hearable 5) Noticeable 6) Obvious 7) Palpable 8) Perceivable 9) Recognizable 10) Seeable 11) Tangible 12) Visible 13) Visual 
• (a.) Capable of being perceived; cognizable; discernible; perceivable.
Per·cep'ti·ble adjective [ Latin perceptibilis : confer French perceptible . See Perceive .] Capable of being perceived; cognizable; discernible; perceivable. « With a perceptible blast of the air.» Bacon. -- Per*cep'ti*ble*ness , 
[adj] - capable of being perceived by the mind or senses
adjective easily perceived by the senses or grasped by the mind; `a perceptible sense of expectation in the court`; `an obvious (or palpable) lie`