Incomplete

a.
  1. Not complete; not filled up; not finished; not having all its parts, or not having them all adjusted; imperfect; defective.
  2. (Bot.) Wanting any of the usual floral organs; -- said of a flower.
    3. Incomplete equation (Alg.),
    an equation some of whose terms are wanting; or one in which the coefficient of some one or more of the powers of the unknown quantity is equal to 0.