ONEROUS Meaning of ONEROUS in English onerous BrE AmE ˈəʊn ə r əs ˈɒn- AmE \ ˈoʊn- ˈɑːn- — Preference poll, British English: ˈəʊn- 76%, ˈɒn- 24%. ▷ onerous|ly li▷ onerous|ness nəs nɪs Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012