ignoramus(n = noun.person) know nothing, uneducated person - an ignorant person; Array
is a kind of unskilled person
has particulars: aliterate, aliterate person, illiterate, illiterate person, nonreader

1.  We are ignorant; we ignore; -- being the word formerly written on a bill of indictment by a grand jury when there was not sufficient evidence to warrant them in finding it a true bill. The phrase now used is, “No bill,” “No true bill,” or “Not found,” though in some jurisdictions “Ignored” is still used. Wharton (Law Dict. ). Burn. [1913 Webster]

2.  A stupid, ignorant person; a vain pretender to knowledge; a dunce. [1913 Webster]
"An ignoramus in place and power." [1913 Webster]

ignoramus, n. (pl. ignoramuses) an ignorant person.

Etymology:
L, = we do not know: in legal use (formerly of a grand jury rejecting a bill) we take no notice of it; mod. sense perh. from a character in Ruggle's Ignoramus (1615) exposing lawyers' ignorance

N  ignoramus, dunce, wooden spoon, no scholar, (imbecility) 499 (folly) 501 moron, imbecile, idiot, fool, jerk, nincompoop, asshole, dilettante, sciolist, smatterer, dabbler, half scholar, charlatan, wiseacre, greenhorn, amateur, novice, tyro, numskull, lubber, fool, pedant, bookless, shallow, ignorant, a wit with dunces and a dunce with wits.