The President was 'conspicuous by his absence' at the peace talks. [=his absence was very noticeable; people had expected him to be there and noticed that he wasn't]
He was 'conspicuously' [='noticeably'] absent from the meeting.
There were a number of 'conspicuous' changes to the building.
(..) That's it, I'm out of ideas. We're closed. Hot air balloon? Too expensive. Giant slingshot? Too conspicuous. Enormous wooden horse? Too Greek! ( speaking baby talk ) No plan. No plan. Can't think. (..)2001 Monsters, Inc.