(plain) vanilla vs tolerable

(plain) vanilla

tolerable

adv
  • tolerably; passably; moderately. 

adj
  • Capable of being borne, tolerated or endured; bearable or endurable. 

  • Moderate in degree; mediocre; passable, acceptable or so-so. 

  • Such as to be tolerated or countenanced; permissible; allowable. 

  • In fair health; passably well. 

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