uncleanly vs unhygienic

uncleanly

adj

  • Dirty, unhygienic, not clean. 

  • Not pure in a moral or religious sense. 

adv

  • not in a clean way; in an unclean way 

unhygienic

adj

  • Lacking hygiene; unclean. 

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