decorative vs undecorative

decorative

noun

  • A plant, tile, etc. intended for use as decoration. 

adj

  • That serves to decorate 

undecorative

adj

  • Unsightly; displeasing to the eye. 

  • Not decorative. 

How often have the words decorative and undecorative occurred in a corpus of books? (source: Google Ngram Viewer )