Easy to see, hear, or become aware of; obvious enough that someone would likely pay attention to it.
From 'notice' (Latin 'notitia' meaning knowledge or awareness) plus the suffix '-able.' The meaning has remained consistent—something that can be noticed.
Psychologically, 'noticeability' is why bright colors in camouflage fail—our brains are wired to spot things that stand out, which is why animals evolved to match their surroundings.
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