helter-skelter vs thoughtlessly

helter-skelter

adv

  • In confused, disorderly haste. 

adj

  • Carelessly hurried and confused. 

noun

  • A helical fairground slide. 

  • Confusion or turmoil. 

thoughtlessly

adv

  • Done without thinking 

How often have the words helter-skelter and thoughtlessly occurred in a corpus of books? (source: Google Ngram Viewer )