needs
adverb /niːdz/
  /niːdz/
(old use)Idioms - in a way that cannot be avoided
- We must needs depart.
 
Word OriginOld English nēdes (from need + -s). 
Idioms 
needs must (when the Devil drives) 
- (saying) in certain situations it is necessary for you to do something that you do not like or enjoy