Ofergais, n. a fruitless attempt
Ofergoel, superstition
Oferiaith, n. useless idle talk
Oferlaeth, n. waste milk
Oferwaith, n. a useless work
Oferwas, n. a worthless chap
Oferwr, n. an idler
Oferymgais, n. an idle attempt
Ofiad, n. a decomposing
Ofiannu, v. to render friable