Source : Webster's Revised Unabridged Dictionary (1913)

Noticeable \No"tice*a*ble\, a.
   Capable of being observed; worthy of notice; likely to
   attract observation; conspicous.

         A noticeable man, with large gray eyes.  --Wordsworth.

Source : WordNet®

noticeable
     adj 1: capable or worthy of drawing attention; "noticeable shadows
            under her eyes"; "noticeable for its vivid historical
            background"; "a noticeable lack of friendliness" [ant:
             {unnoticeable}]
     2: capable of being detected; "after a noticeable pause the
        lecturer continued" [syn: {detectable}]
     3: undesirably noticeable; "the obtrusive behavior of a spoiled
        child"; "equally obtrusive was the graffiti" [syn: {obtrusive}]
        [ant: {unobtrusive}]
     4: readily noticed; "a noticeable resemblance"