boring(causing boredom or tiredness) adjective [UK: ˈbɔːr.ɪŋ] [US: ˈbɔːr.ɪŋ]
dull [duller, dullest](boring, not exciting or interesting, see also: boring) adjective [UK: dʌl] [US: ˈdəl]
tedious(boring, monotonous) adjective [UK: ˈtiː.dɪəs] [US: ˈtiː.diəs]The long wait at the airport was tedious. = La lunga attesa all'aeroporto era tediosa.