\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.