blah vs lackluster

blah

adj
  • Dull; uninteresting; insipid. 

  • Low in spirit or health; down. 

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. 

verb
  • To utter idle, meaningless talk. 

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

  • Nonsense; drivel; idle, meaningless talk. 

lackluster

adj
  • Having no shine or lustre; dull. 

  • Not exceptional; not worthy of special merit, attention, or interest; having no vitality. 

  • Lacking brilliance or intelligence. 

noun
  • Lack of brightness or points of interest. 

  • A person or thing of no particular brilliance or intelligence. 

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