Source : Webster's Revised Unabridged Dictionary (1913)

Needs \Needs\, adv. [Orig. gen. of need, used as an adverb. Cf.
   {-wards}.]
   Of necessity; necessarily; indispensably; -- often with must,
   and equivalent to of need.

         A man must needs love mauger his head.   --Chaucer.

         And he must needs go through Samaria.    --John iv. 4.

         He would needs know the cause of his reulse. --Sir J.
                                                  Davies.

Source : WordNet®

needs
     adv : in such a manner as could not be otherwise; "it is
           necessarily so"; "we must needs by objective" [syn: {inevitably},
            {necessarily}, {of necessity}]