Meaning: Extremely enthusiastic.
Hindi meaning:अत्यंत उत्साही
Synonyms: Spirited, Ardent, Avid, Zealous
Antonyms: Unwilling, Unpassionate, Frigid, Disinclined
Example: I have a grandson who is gung-ho for football.
Trick to remember: Ganga ji mai nahane ko lekar sab bade gung-ho h
