abstractionist abstractionist /əbˈstrækʃənɪst/

adjective

1. Not representing or imitating external reality or the objects of nature  ( abstractionist , nonfigurative , nonobjective , abstract )
   not representing or imitating external reality or the objects of nature
    A large abstract painting
   a large abstract painting
   

noun

1. A painter of abstract pictures  ( abstract artist , abstractionist )
   a painter of abstract pictures