Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "unnoticeably" in a sentence
"The result is supposed to be an improved book -- but at the same time unnoticeably so."
"This kind of prose goes down as easily and unnoticeably as a glass of sparkling water, with no aftertaste."
"He also kept things that belonged to her (and perhaps also to him before they got divorced), and slowly, almost unnoticeably, his feelings towards her changed."