fad 
/ˈfæd/ noun
plural fads /ˈfæd/ noun [count] : something (such as an interest or fashion) that is very popular for a short time
▪ She's always interested in the latest fads. ▪ a fad diet
▪ She's always interested in the latest fads. ▪ a fad diet
— fad·dish /ˈfædɪʃ/ adjective [more faddish; most faddish]
▪ a faddish psychological treatment
/ˈfædɪʃ/ adjective [more faddish; most faddish] ▪ a faddish psychological treatment
