On″er‐ous (?), a. [L. onerosus, fr. onus, oneris, a load, burden: cf. F. onéreux.] Burdensome; oppressive. “Too onerous a solicitude.” I. Taylor.
Onerous cause(Scots Law), a good and legal consideration; — opposed to gratuitous.
Webster's Dictionary 1913
On″er‐ous (?), a. [L. onerosus, fr. onus, oneris, a load, burden: cf. F. onéreux.] Burdensome; oppressive. “Too onerous a solicitude.” I. Taylor.
Onerous cause(Scots Law), a good and legal consideration; — opposed to gratuitous.