need not verb 2need-not noun 1forms 2 verb2 •Indicating absence of necessity; needn't, do(es) not have to, do(es) not need to.My example illustrates how circularity can arise in arguments that appeal to experiment. But the very same example serves to show that this need not be the case. — 2013 •(old-fashioned) Indicating inadvisability; ought not to.Want ads for what little manual labor there was frequently had the stipulation INNA, an acronym for Italians and Irish Need Not Apply. — 2018 need-not noun1 •(no longer used) Something that is not needed or is excessive.Such abundance must be laid out on superfluous recreations, buildings, ornaments, furniture, equipage, attendants, entertainments, visitations, braveries, and a world of need-nots […] — 1673 formsneeded not · need-nots