The headword is a feminine noun, nw/qeia, in the genitive singular (rather than the accusative plural, as the glossing shows); see generally LSJ s.v. It must be extracted from somewhere; perhaps Plato, Theaetetus 195C (web address 1) or Phaedrus 235D (web address 2), where in both places Socrates ironically mocks his own sluggishness of intellect.
cf. generally nu 533, nu 535, nu 537.
[1] The gloss is a feminine noun, braduth/s, in the genitive singular; see generally LSJ s.v. The headword is identically glossed in Photius' Lexicon (nu306 Theodoridis) and similarly glossed in the Synagoge and Lexica Segueriana 307.17.