Conspicuous by one's absence

[Cooliegirly]

If someone is conspicuous by his absence (not literarily absent but being unmentioned of his contribution), does that mean he is aware of his absence or does it mean something else?

[Yankee]

Hi cooliegirly

When you say something/someone is conspicuous by its/his/her absence, that means that the absence/omission is extremely obvious to people in general.

Amy

[DOlier]

His presence or contribution was expected, but didn't materialise.

Art