constantly vs never

constantly

adv
  • In an unchangeable or invariable manner; in every case. 

  • In a constant manner; occurring continuously; persistently. 

  • Recurring regularly. 

never

adv
  • At no time; on no occasion; in no circumstance. 

  • Negative particle (used to negate verbs in the simple past tense; also used absolutely). 

  • Not at any other time; not on any other occasion; not previously. 

intj
  • A statement of defiance 

How often have the words constantly and never occurred in a corpus of books? (source: Google Ngram Viewer )