oner·ous /ˈɑnərəs, ˈo-/
 (a.)繁重的,負有法律責任的
 On·er·ous a.  Burdensome; oppressive. “Too onerous a solicitude.”
 Onerous cause Scots Law, a good and legal consideration; -- opposed to gratuitous.
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 onerous
      adj : not easily borne; wearing; "the burdensome task of preparing
            the income tax return"; "my duties weren't onerous; I
            only had to greet the guests"; "a taxing schedule"
            [syn: burdensome, taxing]