a letter written in 'invisible ink' [=ink that can only be seen when it is specially treated in some way]
It felt like I was 'invisible' at the party. [=no one was paying any attention to me at the party]
With the telescope we can see details of the planet's surface that are ordinarily 'invisible'.
(..) meet Usher, bring him back to Gizzy, and make him have my babies. - You'd have his babies. - Cut it out. My name is Murray. If I had a superpower, it would be invisible and super strength. - Can only have one. - No, only one. Fine, I pick super strength. I'm Nathan. My special power (..)2014 The Dark Horse