annoyance [annoyances](that which annoys) noun [UK: ə.ˈnɔɪəns] [US: ə.ˌnɔɪəns]It'll become an annoyance sooner or later. = Tarde o temprano se convertirá en una molestia.
hassle [hassles](action which is not worth the difficulty involved) noun [UK: ˈhæs.l̩] [US: ˈhæs.l̩]Demand a lot from yourself and expect little from others. This way you'll save yourself a lot of hassle. = Exige mucho de ti y espera poco de los demás. Así te ahorrarás molestias.
nuisance [nuisances](minor annoyance or inconvenience) noun [UK: ˈnjuːsns] [US: ˈnuː.səns]I hate to be a nuisance. = Detesto ser una molestia.
trouble [troubles](effort) noun [UK: ˈtrʌb.l̩] [US: ˈtrʌb.l̩]It's no trouble at all. = No es ninguna molestia.