Indicative of shame; ashamed: a shamefaced explanation.
Extremely modest or shy; bashful.
[By folk etymology from obsolete shamefast, bashful, ashamed, from Middle English, from Old English sceamfæst : sceamu, shame + fæst, fixed; see fast1.] shame'fac'ed·ly (-fā'sĭd-lē) adv., shame'fac'ed·ness n.
1555, "modest, bashful," folk etymology alteration of shamefast, from O.E. scamfæst "bashful," lit. "restrained by shame," or else "firm in modesty," from shame + -fæst, adjectival suffix (see fast (adj.)).