Apt name for a worrywart

The answer to the crossword question “Apt name for a worrywart is STU” is related to the play on words formed by the phrase “S.T.U” which stands for “Sweating The Unknown.” The name STU is highly appropriate for a worrywart as it illuminates the tendency of such individuals to constantly fret over things that are uncertain or unknown. They tend to sweat the small stuff and are always concerned about things that might go wrong. Consequently, STU is a fitting moniker that highlights the individual’s tendency to worry excessively.