Obs. exc. dial. [prob. f. FLUE a.2 (which however is later in our quots.) + -Y1.] = FLUE a.2
1552. Raynalde, Birth Mankynde, I. viii. 13 a. The sede and sparme [of women is] weake, fluy, cold, and moyste, and of no greate fyrmytie.
1876. Surrey, Provincialisms (E.D.S.), s.v. Fluey, of a weak delicate constitution . I have never heard the word applied except to animals.