invisible

The word “invisible” means not able to be seen, either because it is hidden or because it does not reflect light. In plain terms, something that cannot be seen — either physically, or figuratively, like feeling ignored.

“Invisible” is pronounced ihn-VIH-zuhbl (/ɪnˈvɪzəb(ə)l/ in IPA).

Here is “invisible” used in a sentence: “Germs are invisible to the naked eye.”

Words with a similar meaning to “invisible” include disapparent, inapparent, inconspicuous, invis, inviso and nondisplayed.

The opposite of “invisible” — its antonyms — is visible.

“Invisible” is an adjective.

The word “invisible” comes from Late Latin. From Old French invisible, from Late Latin invisibilis, literally "not able to be seen" (in-, "not," + visibilis, "visible").

“Invisible” is a fairly common word in modern English, usually learned at around the B2 level.

Invisible is the correct word; 'unvisible' is not standard English. The negative of visible is formed with the prefix in-, giving invisible, and the related noun is invisibility.

Hidden means deliberately placed or kept out of sight, while invisible means not able to be seen at all, whether because something is concealed or because it does not reflect light. A key under a mat is hidden but not invisible; air is invisible without being hidden.

Transparent describes something you can see through, like clear glass — the object itself is still visible. Invisible means the thing cannot be seen at all. A clean window is transparent; the air in a room is effectively invisible.