(chiefly UK, auxiliary, indicating absence of necessity) Doesn't have to, don't have to. / (auxiliary, indicating inadvisability) Ought not to.

plural of needful

Lacking basic necessities such as food and shelter; poor; indigent. / In distress or otherwise difficult circumstances. / (when followed by “of”) needing (the specified necessities).

plural of needing

plural of needfulness

(rare) Something that is not needed or is excessive.

(idiomatic) Needs for special care, services or accommodations for disabilities.

(dated) A pleonastic intensification of must using the adverb needs, meaning “must necessarily”.

Of necessity or need; necessarily.

Third-person singular simple present indicative form of need no introduction