► 名詞不振  [ふしん]    
meaning:  decrease  rank: 3☆ 
最近食欲不振が
続いている ⇨ I’ve been having a decreased, haven’t had much, appetite lately
不振  [ふしん]    
meaning:  slump  rank: 3☆ 
彼は
今季不振が
続いている ⇨ He is in a slump, not performing well, this season
More examples:- チームメイトが全く不振の中、彼はホームランを二本打って一人気を吐いた ⇨ While his teammates were completely shut out, he alone performed well, hitting two home runs
 - チームは過去十年間不振に喘いでいる ⇨ The team has been struggling in the last 10 years