The term 'slightest bit' can be broken down into six different crossword solutions: IOTA (4 letters), INCH (4 letters), WHIT (4 letters), OUNCE (5 letters), TAD (3 letters), and FIG (3 letters). IOTA is a Greek letter that is the ninth letter of the Greek alphabet. An INCH is a unit of length in the imperial and US customary systems, equal to 1/12 of a foot. WHIT is an old English unit of length, equal to 1/6 of an INCH. An OUNCE is a unit of mass or weight in the imperial and US customary systems, equal to 28.35 grams. A TAD is an informal term for a very small amount. Finally, a FIG is a small amount, especially of money.