Changeling

Change·ling

Changeling

n.
  1. One who, or that which, is left or taken in the place of another, as a child exchanged by fairies.
    Such, men do changelings call, so changed by fairies' theft.
    The changeling [a substituted writing] never known.
  2. A simpleton; an idiot.
    Changelings and fools of heaven, and thence shut out. Wildly we roam in discontent about.
  3. One apt to change; a waverer.

Changeling

a.
  1. Taken or left in place of another; changed.
  2. Given to change; inconstant. [Obs.]
    Some are so studiously changeling.