The phrase "grow enthusiastic" is a correct and usable part of a sentence in written English.
It means to become more and more excited or passionate about something. Example: As soon as the music started playing, the crowd grew enthusiastic and began dancing and singing along.
Later that year, Mr. Diller seemed to grow enthusiastic about using his company's 12 television stations to lure audiences with local programming.
One person who has worked with him, for example, asserted that Mr. Fayed would often grow enthusiastic about a new executive and lose interest six months later, when results did not materialize fast enough.
It is excusable to grow enthusiastic over the infinite numbers of organic beings with which the sea of the tropics, so prodigal of life, teems", though he cautioned against the "rather exuberant language" used by some naturalists.
"Do truth, freedom, humanity, justice, desire anything else than that you grow enthusiastic and serve them?...God and mankind have concerned themselves for nothing, for nothing but themselves...Away, then, with every concern that is not altogether my concern!
Ms. Cole grew enthusiastic when she recalled how her father used to go to the park and play songs.
Mr. Sanders grows enthusiastic when talking about research initiatives, which, he said, occupy a quarter of his time.
WASHINGTON — Billy Bob Brown, a farmer in Panhandle, Tex., grows enthusiastic when he discusses his 2008 trip to Cuba, where he and three partners showed off Texas sausages, cakes and frozen desserts to Cuban tourism executives.
She seemed to be on guard, lest they grow too enthusiastic — just as a driving instructor might not want his students to get too excited about their driving.
Cancer researchers are growing increasingly enthusiastic about harnessing the body's own immune system to fight tumors.
With each bite of verbena-scented, syrupy plum lightened by the buoyant cream, my guests grew increasing enthusiastic.
