Needs

• POS: Adverb

CIDE DICTIONARY

Needs, adv. [Orig. gen. of need, used as an adverb. Cf. -wards.].

 Of necessity; necessarily; indispensably; -- often with must, and equivalent to of need.  [1913 Webster]
"A man must needs love mauger his head."  [1913 Webster]
"And he must needs go through Samaria."  [1913 Webster]
"He would needs know the cause of his repulse."  [1913 Webster]

OXFORD DICTIONARY

Needs, adv. archaic (usu. prec. or foll. by must) of necessity (must needs decide).

Etymology

OE nedes (as NEED, -S(3))