ˌən,
                                                                                                                               often  ˈən,
                                                                                                                               before  stressed syllable ˈ-
                                                      
                                                          1
                    
                                          
              
          
                                                      : not : in-, non-                                      
                
                  —in adjectives formed from adjectives
unambitious
unskilled
             or participlesundressed
            , in nouns formed from nounsunavailability
            , and rarely in verbs formed from verbsunbe
                  —sometimes in words that have a meaning that merely negates that of the base word and are thereby distinguished from words that prefix in- or a variant of it (such as im-) to the same base word and have a meaning positively opposite to that of the base wordunartistic
unmoral
    
                
                    2
                    
                                          
              
          
                                                      : opposite of : contrary to                                      
                
                  —in adjectives formed from adjectives
unconstitutional
ungraceful
unmannered
             or participlesunbelieving
             and in nouns formed from nounsunrest
    
                
                    1
                    
                                          
              
          
                                                      : do the opposite of : reverse (a specified action) : de- sense 1a, dis- sense 1a                                      
                
                  —in verbs formed from verbs
unbend
undress
unfold
    
                
                    2
                    
        a
    
          
                                          
              
          
                                                      : deprive of : remove (a specified thing) from : remove                                      
                
                  —in verbs formed from nouns
unfrock
unsex
    
                
                    
        b
    
          
                                          
              
          
                                                      : release from : free from                                      
                
                  —in verbs formed from nouns
unhand
    
                
                    
        c
    
          
                                          
              
          
                                                      : remove from : extract from : bring out of                                      
                
                  —in verbs formed from nouns
unbosom
    
                
                    
        d
    
          
                                          
              
          
                                                      : cause to cease to be                                      
                
                  —in verbs formed from nouns
unman
    
                
                    3
                    
                                          
              
          
                                                      : completely                                      
              
                             
unloose
                         
                
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  Merriam-Webster unabridged




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