The term 'least possible' can be described by three crossword solutions: MINIMAL (7 letters), FEWEST (6 letters), and littlest (8 letters). MINIMAL refers to the smallest amount or degree of something, while FEWEST implies the lowest number of something. Littlest is a comparative form of little, which means small in size, amount, or degree. Therefore, all three words refer to the concept of having the least amount or degree of something.