Source : Webster's Revised Unabridged Dictionary (1913)

Submissive \Sub*mis"sive\, a.
   1. Inclined or ready to submit; acknowledging one's
      inferiority; yielding; obedient; humble.

            Not at his feet submissive in distress, Creature so
            fair his reconcilement seeking.       --Milton.

   2. Showing a readiness to submit; expressing submission; as,
      a submissive demeanor.

            With a submissive step I hasted down. --Prior.

   Syn: Obedient; compliant; yielding; obsequious; subservient;
        humble; modest; passive. -- {Sub*mis"sive*ly}, adv. --
        {Sub*mis"sive*ness}, n.

Source : WordNet®

submissiveness
     n : the trait of being willing to yield to the will of another
         person or a superior force etc.