Having a protruding jaw giving the face a gaunt appearance.

Roget 203: narrow, close; slender, thin, fine; thread-like etc. (filament) 205; finespun^†, gossamer; paper-thin; taper, slim, slight-made; scant, scanty; spare, delicate, incapacious^†; contracted etc. 195; unexpanded etc. (expand) etc. 194^†; slender as a thread.    [in reference to people or animals] emaciated, lean, meager, gaunt, macilent^†; lank, lanky; weedy, skinny; scrawny slinky [U.S.]; starved, starveling; herring gutted; worn to a shadow, lean as a rake [Chaucer]; thin as a lath, thin as a whipping post, thin as a wafer; hatchet-faced; lantern-jawed.    attenuated, shriveled, extenuated, tabid^†, marcid^†, barebone, rawboned.    monomolecular.    ... show more