adjective
1.
Synonyms: giddy 1, dizzy, featherbrained, flighty, frivolous, harebrained, rattlebrained, scatterbrained, silly, skittish
Related Word: brainless, rattleheaded; ignorant, simple
2.
Synonyms: vacuous 2, vacant
3.
Synonyms: ignorant 1, benighted, illiterate, know-nothing, rude, uneducated, uninstructed, unlettered, unschooled, untaught