I straightened my hair today.
I don't think anyone noticed
but if they did, they didn't say it.
That's the case with most things we notice. We don't say we've noticed them so they remain unsaid; not unnoticed.
Easy to confuse the two though.
Right?
I mean it's easy to assume that the unsaid has been unnoticed but not vice versa.
Anyway,
I noticed the tape stuck on your mouth.