Roget's Thesaurus: Entry 574 (Vigor)

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#574. Vigor. -- N. vigor, power, force; boldness, raciness &c. adj.; intellectual, force; spirit, point, antithesis, piquance, piquancy; verve, glow, fire, warmth; strong language; gravity, sententiousness; elevation, loftiness, sublimity.

eloquence; command of words, command of language.

Adj. vigorous, nervous, powerful, forcible, trenchant, incisive, impressive; sensational.

spirited, lively, glowing, sparkling, racy, bold, slashing; pungent, piquant, full of point, pointed, pithy, antithetical; sententious.

lofty, elevated, sublime; eloquent; vehement, petulant, impassioned; poetic.

Adv. in glowing terms, in good set terms, in no measured terms.

Phr. "thoughts that breath and words that burn" [Gray].