drab vs irregular

drab

noun
  • A dull or uninteresting appearance or situation, unremarkable. 

  • An instance of a transgender or non-binary person presenting as the gender corresponding to their sex assigned at birth instead of that corresponding to their internal gender identity (for instance, a trans woman dressed as a man). 

  • A fabric, usually of thick cotton or wool, having a dull brownish yellow, dull grey, or dun colour. 

  • Often in the plural form drabs: apparel, especially trousers, made from this fabric. 

  • The colour of this fabric. 

  • A small amount, especially of money. 

  • A box used in a saltworks for holding the salt when taken out of the boiling pans. 

adj
  • Of the colour of some types of drabcloth: dull brownish yellow or dun. 

  • Particularly of colour: dull, uninteresting. 

irregular

noun
  • One who does not regularly attend a venue. 

  • A soldier who is not a member of an official military force and who may not use regular army tactics. 

adj
  • without symmetry, regularity, or uniformity 

  • rough 

  • not regular; having sides that are not equal or angles that are not equal 

  • whose faces are not all regular polygons (or are not equally inclined to each other) 

  • nonstandard; not conforming to rules or expectations 

  • not following the regular or expected patterns of inflection in a given language 

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