at all vs ever

at all

adv
  • Indicating degree, quantity or frequency greater than zero: to the slightest degree, in any way, at any time or in any circumstance. 

ever

adv
  • At any time. 

  • As intensifier following an interrogative word. 

  • In any way. 

  • Continuously, constantly, all the time (for the complete duration). 

  • Always, frequently, forever. 

det
  • Shortening of every 

adj
  • Occurring at any time, occurring even but once during a timespan. 

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