1796, "worthy of notice, likely to attract attention," from notice (n.) + -able. Meaning "capable of being noticed or observed" is from 1809. Related: Noticeably.
a noticeable lack of friendliness
noticeable for its vivid historical background
noticeable shadows under her eyes
after a noticeable pause the lecturer continued
nother
nothing
nothingarian
nothingness
notice
noticeable
notification
notify
notion
notional
notochord