Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (II) Communication of Ideas
Section III. Means of Communicating Ideas
Various Qualities of Style

574. Vigor.

   NOUN:VIGOR, power, force; boldness, raciness &c. adj.; intellectual force; spirit, punch [slang], point, piquancy; verve, ardor, enthusiasm, glow, fire, warmth; strong language; gravity, weight, sententiousness.
  LOFTINESS, elevation, sublimity, grandeur.
  ELOQUENCE; command of words, command of language.
   ADJECTIVE:VIGOROUS, nervous, powerful, forcible, forceful, mordant, biting, trenchant, incisive, graphic, impressive; sensational.
  SPIRITED, lively, glowing, sparkling, racy, bold, slashing, crushing; pungent, piquant, full of pep [slang], having punch [slang], full of point, pointed, pithy; sententious.
  LOFTY, elevated, sublime, poetic, grand, weighty, ponderous; eloquent.
  VEHEMENT, petulant, passionate, burning, impassioned.
   ADVERB:in -glowing, – good set, – no measured- terms; with his heart on fire; like a ton of bricks [colloq.].
   QUOTATION:Thoughts that breathe and words that burn.—Gray