Powerful and effective language:
— His eloquence attracted a large congregation.

synonyms: fluency, smoothness.

Roget 574: vigor, power, force; boldness, raciness etc. 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.    ... show more

Roget 582: speech, faculty of speech; locution, talk, parlance, verbal intercourse, prolation^†, oral communication, word of mouth, parole, palaver, prattle; effusion.    oration, recitation, delivery, say, speech, lecture, harangue, sermon, tirade, formal speech, peroration; speechifying; soliloquy etc. 589; allocution etc. 586; conversation etc. 588; salutatory : screed: valedictory [U.S.].    oratory; elocution, eloquence; rhetoric, declamation; grandiloquence, multiloquence^†; burst of eloquence; facundity^†; flow of words, command of words, command of language; copia verborum [Lat.]; power of speech, gift of the gab; usus loquendi [Lat.].    speaker etc. v.; spokesman; prolocutor, interlocutor; mouthpiece, Hermes; orator, oratrix^†, oratress^†; Demosthenes, Cicero; rhetorician; stump orator, platform orator; speechmaker, patterer^†, improvisatore^†.    ... show more

Dutch: eloquentie, welsprekendheid, welbespraaktheid, spreekvaardigheid
Polish: elokwencja, mówność, wygadanie, wymowność