The Collaborative International Dictionary of English v.0.48:

Submiss \Sub*miss"\, a. [L. submissus, p. p. of submittere to
   let down, to lower. See Submit.]
   1. Submissive; humble; obsequious. [Archaic] "Soft Silence
      and submiss Obedience." --Spenser. "Stooping and submiss."
      --R. L. Stevenson.
      [1913 Webster]

   2. Gentle; soft; calm; as, submiss voices. [R.]
      [1913 Webster]