irregular vs smooth

irregular

adj
  • nonstandard; not conforming to rules or expectations 

  • 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) 

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

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

  • One who does not regularly attend a venue. 

smooth

adj
  • Involuntary and non-striated. 

  • Having derivatives of all finite orders at all points within the function’s domain. 

  • Flowing or uttered without check, obstruction, or hesitation; not harsh; fluent. 

  • Natural; unconstrained. 

  • Not grainy; having an even texture. 

  • Without difficulty, problems, or unexpected consequences or incidents. 

  • That factors completely into small prime numbers. 

  • Having a texture that lacks friction. Not rough. 

  • Unbroken. 

  • Lacking marked aspiration. 

  • Lacking projections or indentations; not serrated. 

  • Placid, calm. 

  • Having a pleasantly rounded flavor; neither rough nor astringent. 

  • Suave; sophisticated. 

  • Bland; glib. 

verb
  • To make smooth or even. 

  • To make straightforward or easy. 

  • To stroke; especially to stroke an animal's fur. 

  • To reduce to a particular shape or form by pressure; to press, to flatten. 

  • To calm or palliate. 

  • To capture important patterns in the data, while leaving out noise. 

adv
  • Smoothly. 

noun
  • The analysis obtained through a smoothing procedure. 

  • Something that is smooth, or that goes smoothly and easily. 

  • A domestic animal having a smooth coat. 

  • A member of an anti-hippie fashion movement in 1970s Britain. 

  • A smoothing action. 

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