Definition of opportuneful in English:
opportuneful
Pronunciation /ɒpəˈtjuːnf(ʊ)l/ /ɒpəˈtʃuːnf(ʊ)l/
adjective
rare Affording opportunity; convenient, favourable.
Origin
Early 17th century; earliest use found in First Part of Jeronimo. From opportune + -ful.