biased vs on the fence

biased

adj
  • Exhibiting a systematic distortion of results due to a factor not allowed for in its derivation; skewed. 

  • Exhibiting bias; prejudiced. 

  • Angled at a slant. 

  • On which an electrical bias is applied. 

on the fence

prep
  • undecided; wavering in one's opinion 

  • Used other than figuratively or idiomatically: see on, the, fence. 

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