least

(noun) something that is of no importance. Examples: "It is the least i can do." "That is the least of my concerns."

(adj) the superlative of `little' that can be used with mass nouns and is usually preceded by `the'; a quantifier meaning smallest in amount or extent or degree. Synonyms: least(prenominal) (vs. most). Examples: "Didn't care the least bit." "He has the least talent of anyone."

(adv) used to form the superlative. Synonyms: to the lowest degree. Example: "The garter snake is the least dangerous snake."