simlin-headedadj.U.S.colloquial (now rare) foolish, stupid; = pumpkin-headedadj. at pumpkin-headn. Derivatives.
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1871 Atlanta (Georgia) Daily Sun 26 Sept. Edward Jones was a simlin-headed nigger, who owned up to being drunk.
1958 Chron. (Port Neches, Texas) 24 Dec. Anybody over 50 who smiles during the interval between getting up and drinking a cup of coffee is a hypocrite or a simlin-headed optimist.