The Collaborative International Dictionary of English v.0.48:

Forced \Forced\, a.
   Done or produced with force or great labor, or by
   extraordinary exertion; hurried; strained; produced by
   unnatural effort or pressure; as, a forced style; a forced
   laugh.
   [1913 Webster]

   Forced draught. See under Draught.

   Forced march (Mil.), a march of one or more days made with
      all possible speed. -- For"ced*ly, adv. --
      For"ced*ness, n.
      [1913 Webster]