† indefinible,a.Obs.rare—1. [f. in-3 + L. *dēfīnībilis, f.dēfīnīre to set bounds, bound, limit: see define v.] Incapable of being limited; illimitable. 1652Benlowes Theoph.Ded. 22 The Empyræan flame of the Divinity, Indefinible, Interminable, Ineffable.