blah vs mundane

blah

adj
  • Dull; uninteresting; insipid. 

  • Low in spirit or health; down. 

noun
  • (in plural, the blahs) A general or ambiguous feeling of discomfort, dissatisfaction, uneasiness, boredom, mild depression, etc. 

  • Nonsense; drivel; idle, meaningless talk. 

verb
  • To utter idle, meaningless talk. 

intj
  • An expression of mild frustration. 

  • Representing the sound of vomiting. 

  • Imitative of idle, meaningless talk; used sometimes in a slightly derogatory manner to mock or downplay another's words, or to show disinterest in a diatribe, rant, instructions, unsolicited advice, parenting, etc. Also used when recalling and retelling another's words, as a substitute for the portions of the speech deemed irrelevant. 

mundane

adj
  • Tedious; repetitive and boring. 

  • Worldly, earthly, profane, vulgar as opposed to heavenly. 

  • Ordinary; not new. 

  • Pertaining to the Universe, cosmos or physical reality, as opposed to the spiritual world. 

noun
  • An unremarkable, ordinary human being. 

  • A person considered to be "normal", part of the mainstream culture, outside the subculture, not part of the elite group. 

  • The world outside fandom; the normal, mainstream world. 

  • A person who is not a Satanist. 

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