Synonyms for Flourishing:

adj.

healthy (adjective)
healthy.
ostentatious (adjective)
forced, sensational, dramatic, fussy, garish, dashing, jaunty, affected, opulent, grandiloquent, flashy, flagrant, splashy, shameless, pompous, flamboyant, formal, ostentatious, exhibitionistic, vain, blatant, ornate, showy, snazzy, gaudy, histrionic, boastful, stilted, Flaunting, rakish, grandiose.
prospering, going well (adjective)
growing, roaring, rich, prosperous, thriving, luxuriant, successful.
prosperous (adjective)
palmy.
successful (adjective)
thriving.

n.

thrive, boomy, thrifty. flourishing (noun)
healthy, booming, thriving, palmy, successful, growing, prospering, roaring, prosperous.
thriving (noun)
luxuriant, rich.

v.

demonstrating (verb)
Evincing, Manifesting, showing, Presenting, Exposing, Illustrating, unveiling, convincing, Indicating, Displaying, uncovering, demonstrating, unmasking, Exhibiting.
prospering (verb)
succeeding, thriving, prospering, Progressing, Luxuriating.

Other synonyms:

boomy. thrifty. Other relevant words:
luxuriant, booming, roaring, growing, thrive, boomy, palmy, successful, healthy, rich, prosperous, thrifty.

Usage examples for flourishing

  1. Guns suddenly seemed to be flourishing everywhere. – Police Your Planet by Lester del Rey
  2. They had joined forces to resist the king of the Elamites, and they had just lost the decisive battle of the campaign when the catastrophe which destroyed the five cities and spread desolation in the flourishing valley took place. – Complete Story of the San Francisco Horror by Richard Linthicum Trumbull White Samuel Fallows
  3. But before the new million- dollar bridge was finished the Pepsy Roadside Rest was flourishing as the only real " monolopy" in Everdoze. – Pee-wee Harris by Percy Keese Fitzhugh