burdensome(of or like a burden; arduous or demanding) adjective [UK: ˈbɜːdn.səm] [US: ˈbɝː.dən.səm]
choosy(taking care when choosing that what is chosen best suits one's tastes, desires or requirements) adjective [UK: ˈtʃuː.zi] [US: ˈtʃuː.zi]Don't be so choosy. = No seas tan exigente.
demanding(requiring much endurance, strength, or patience) adjective [UK: dɪ.ˈmɑːnd.ɪŋ] [US: ˌdɪ.ˈmænd.ɪŋ]Yanni is so demanding. = Yanni es así de exigente.
exacting(making great demands; difficult to satisfy) adjective [UK: ɪɡ.ˈzækt.ɪŋ] [US: ɪg.ˈzækt.ɪŋ]
exigent(demanding; needing great effort) adjective [UK: ˈeɡ.zɪ.dʒənt] [US: ˈek.sɪ.dʒənt]
fastidious(difficult to please) adjective [UK: fə.ˈstɪ.dɪəs] [US: fæ.ˈstɪ.diəs]
picky [pickier, pickiest](fussy, particular) adjective [UK: ˈpɪk.i] [US: ˈpɪk.i]I think you're too picky. = Creo que eres demasiado exigente.