adumbrate - Dictionary definition and meaning for word adumbrate
A dumb brat can't give the details - just a sketchy outline.
umbra means shadow, ad+umbra means to shadow the details, so the word means outline, to shadow, obscure and overshadow.
A+DUMB+REPRESENTATION=ADUMBRATION...imagine a dumb is giving you a representation...how will he do it???....represent in outline,indicate faintly...
A dumb rate is always vague.