Flagging(adjective)
Meaning: becoming weaker.
Hindi meaning:क्षीण होता हुआ
Synonyms: Abating, Wearying, Dwindling, Wilting
Antonyms: Growing, Budding, Emergent, Developing
Example: He's trying to revive his flagging career.
Trick to remember: Aging(age ka badhna) ke sath sath he is flagging 
