Lewis Short
(adjective) : flexĭbĭlis, e, flexus, from flecto
* That may be bent, pliant, flexible (class.; cf.: lentus, flexilis).
* Lit.: materiam rerum totam esse flexibilem et commutabilem,Cic. N. D. 3, 39, 92: arcus,Ov. Am. 3, 3, 29: (ulmus) ad currus flexibili vite,Plin. 16, 43, 83, § 228.
* Trop.
* Pliant, flexible, tractable: genera vocis permulta: grave, acutum; flexibile, durum,flexible,Cic. N. D. 2, 58, 146; cf. oratio,id. Or. 16, 52: nihil tam flexibile,id. Brut. 79, 274: vox,Quint. 11, 3, 15; 40: nihil non flexibile ad bonitatem,Cic. Att. 10, 11, 1.—*
* In a bad sense, fickle, wavering, inconstant: quid potest esse tam flexibile, tam devium, quam animus ejus, qui, etc.,Cic. Lael. 25, 92.
Charlton T. Lewis, Charles Short, A Latin Dictionary