a. (UN-1 7 b.)
1611. Cotgr., Imbuvable, vndrinkable, unfit to be drunke of.
1826. Disraeli, V. Grey, VI. i. We refrain from refreshing our bodies with that sanctified and most undrinkable fluid.
1880. Geikie, Phys. Geog., iii. 107. Should he taste some of this water he would find it salt and undrinkable.
Hence Undrinkably adv.
1894. Pall Mall Mag., Nov., 455. It [sc. coffee] was not undrinkably bad.