Invisible /(?)/

In·vis·i·ble

Invisible

a.
  1. Incapable of being seen; not perceptible by vision; not visible.
    To us invisible, or dimly seen In these thy lowest works.
  2. Hidden from the public; as, invisible transactions.
  3. imperceptible to the mind; as, differences invisible to most observers.

Phrases & Compounds
Invisible bird
a small, shy singing bird (Myadestes sibilons), of St. Vincent Islands.
Invisible green
a very dark shade of green, approaching to black, and liable to be mistaken for it.

Invisible

n.
  1. An invisible person or thing; specifically, God, the Supreme Being.
  2. A Rosicrucian; -- so called because avoiding declaration of his craft. [Obs.]
  3. One of those (as in the 16th century) who denied the visibility of the church. (Eccl. Hist.)