DUNCICAL

blockheaded, boneheaded, duncical, duncish, fatheaded, loggerheaded, thick, thickheaded, thick-skulled, wooden-headed

(adjective) (used informally) stupid

Source: WordNet® 3.1

Etymology

Adjective

duncical (comparative more duncical, superlative most duncical)

(archaic) Like a dunce; stupid.

Source: Wiktionary

Dun"ci*cal, a.

Definition: Like a dunce; duncish. The most dull and duncical commissioner. Fuller.

Source: Webster’s Unabridged Dictionary 1913 Edition