The term 'becomes tiresome' can be represented by three crossword solutions: CLOYS (5 letters), PALLS (5 letters), and WEARSTHIN (9 letters). CLOYS is a verb meaning to cloy or to become sickeningly sweet or excessive. PALLS is a verb meaning to become dull or uninteresting. WEARSTHIN is an adjective meaning to become thin or weak due to overuse or repetition. Together, these words describe the process of something becoming tiresome due to its excessive sweetness, dullness, or overuse.