WordWeb Online

1. Capable or worthy of being noticed
   "noticeable shadows under her eyes"; "noticeable for its vivid historical background"; "a noticeable lack of friendliness"
    
2. Capable of being detected
   "after a noticeable pause the lecturer continued";
   - detectable

See also: broad, detectable, discernible, evident, marked, noticeability, noticeableness, observable, obtrusive, obviousness, patency, perceptible, pronounced

Antonym: unnoticeable

Encyclopedia: Noticeable