not not /ˈnɑːt/

adverb

1. () Negation of a word or group of words  ( non , not )
   negation of a word or group of words
    He does not speak French
   he does not speak French
    She is not going
   she is not going
    They are not friends
   they are not friends
    Not many
   not many
    Not much
   not much
    Not at all
   not at all