1.
[syn: burdensome, onerous, taxing]
The Collaborative International Dictionary of English v.0.48:
Onerous \On"er*ous\, a. [L. onerosus, fr. onus, oneris, a load,
burden: cf. F. on['e]reux.]
Burdensome; oppressive. "Too onerous a solicitude." --I.
Taylor.
[1913 Webster]
Onerous cause (Scots Law), a good and legal consideration;
-- opposed to gratuitous.
[1913 Webster]
WordNet (r) 3.0 (2006):
onerous
adj 1: 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, onerous, taxing]