What this suffix does
-witted forms compound adjectives describing the speed, sharpness, or quality of a person's wit and intelligence — particularly their ability to think quickly and cleverly. Quick-witted, sharp-witted, dim-witted, half-witted, nimble-witted — each compound places someone on a spectrum of mental agility. The suffix is most common in literary and educated register, and is often preferred over more blunt alternatives (e.g., "dim-witted" over "stupid" in polite critique).