least

Adjective

• 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
  • didn't care the least bit
    
  • he has the least talent of anyone
    

Adverb

• used to form the superlative
  • The garter snake is the least dangerous snake
    

Noun

• something that is of no importance
  • it is the least I can do
    
  • that is the least of my concerns
    

Related words

• Synonyms: 
  least(a) , to the lowest degree
• Antonyms: 
  most(a) , most , to the highest degree