Lewis & Short

quantus-lĭbet, tălibet, tumlĭbet, adj., as great as you please, how great soever, ever so great (poet. and in post-Aug. prose): quantolibet ordine dignus, Ov. F. 6, 669: saevitia hiemis, Col. 8, 17, 11: facilitas, Tac. Agr. 6: quantālibet lassitudine recreari defessos, Plin. 27, 12, 104, § 127.
Neutr. adverb.: quantum-lĭbet, how much soever, ever so much: quantumlibet intersit, Liv. 39, 37, 14; Quint. 12, 6, 4: te quantumlibet oderint hostes, Eum. Pan. Const. 10.