Worry (over) is a feeling of anxiety or concern about a potential problem or situation. The crossword solutions for this term are STEW (4 letters), FRET (4 letters), and STRESS (6 letters). STEW is an informal verb meaning to worry or be anxious about something, while FRET is a verb meaning to feel or express worry or anxiety. Finally, STRESS is a noun referring to a state of mental or emotional strain or tension resulting from adverse or demanding circumstances.