lethargy vs luster

lethargy

noun
  • A condition characterized by extreme fatigue or drowsiness, deep unresponsiveness, or prolonged sleep patterns. 

  • A state of extreme torpor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness. 

luster

verb
  • To gleam, have luster. 

  • To give a coating or other treatment to impart physical luster. 

  • To give luster, distinguish. 

noun
  • Refinement, polish or quality. 

  • Shine, polish or sparkle. 

  • Lusterware. 

  • One who lusts or is inflamed with lust. 

  • A candlestick, chandelier, girandole, etc. generally of an ornamental character. 

  • A substance that imparts lustre to a surface, such as plumbago or a glaze. 

  • A fabric of wool and cotton with a lustrous surface, used for women's dresses. 

  • Brilliance, attractiveness or splendor. 

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