From Longman Dictionary of Contemporary Englishamateurisham‧a‧teur‧ish /ˈæmətərɪʃ, -tʃʊə-, -tʃə- ˌæməˈtɜːrɪʃ $ ˌæməˈtʊr-, -ˈtɜːr-/ adjective BAD BEHAVIOUR OR ACTIONSnot skilfully done or made OPP professional His paintings are rather amateurish. —amateurishly adverb —amateurishness noun [uncountable]
Examples from the Corpus
amateurish• All these look, to Western eyes, childish as well as amateurish.• But the rest of the acting is either poorly thought out or downright amateurish.• Is his dramatic performance appropriate parody or merely amateurish?• But the campaigns have been very amateurish and low-key and many of the younger people are not interested.• Most were amateurish endeavors, he said.• But efforts to keep the narrative on track are often disrupted by amateurish lighting and camerawork.• For the subsidy has encouraged amateurish management and an uncommercial approach.• It was a surprisingly amateurish movie.• But security officials also noted several signs of amateurish work. 