unhindered vs without restraint

unhindered

adj
  • Not hindered, slowed, blocked or hampered. 

  • Pertaining to a molecule where the reactive center is not blocked from chemical attack due to the surrounding uncreative substituents not preventing reactive agents accessing the reactive site. 

without restraint

How often have the words unhindered and without restraint occurred in a corpus of books? (source: Google Ngram Viewer )