The crossword solutions for the term 'String Bean's Opposite' are 'BLIMP' and 'Fatso, ' both of which have five letters. BLIMP is a term used to describe a large, cigar-shaped airship, usually filled with helium or hydrogen, that is used for advertising, surveillance, or other purposes. Fatso is an informal term used to describe someone who is overweight. Therefore, the two terms together can be used to describe the opposite of a string bean, which is a thin person.