onerous
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1. Of the nature of a burden; burdensome; oppressive, troublesome.

    b. Of the nature of a legal burden, or obligation.

    2. Sc. Law. Done or given for value received, being for a
consideration: opposed to gratuitous; as in onerous consideration, grant,
property, title, etc. (So, in Fr. law, titre onéreux, etc.)

    Hence {sm}onerously adv., in an onerous or burdensome manner; {sm}onerousness,
burdensomeness.