dull-witted

the compound "dull-witted" is a transparent english formation from two germanic roots. "dull" evolved from an old english term for foolishness, carrying the metaphorical sense of being mentally blunt or slow, much like a dull blade is ineffective for cutting. "witted" derives from the old english word for knowledge and intellect, forming the second element in many compounds describing mental acuity. the literal combination, "having a dull mind," directly and logically conveys the modern abstract meaning of being slow to comprehend or lacking intelligence.

Structure: dull (blunt, slow) + witted (mind, intelligence) dull: from old english dol meaning "foolish, erring," of germanic origin; functions as an adjective describing a lack of sharpness or quickness. witted: from old english witt meaning "understanding, intellect," of germanic origin; functions as a noun-forming element here, combined with '-ed' to create an adjective meaning "having a particular kind of mind."