even though vs regardless

even though

conj

  • Although; though; despite or in spite of the fact that. 

regardless

prep

  • Synonym of regardless of; paying no attention to 

adv

  • Without attention to warnings or indications of bad consequences. 

adj

  • despite everything; despite the situation 

  • Having no regard; heedless; careless. 

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