adverb

opiniâtrement

/ɔ.pi.nja.tʁə.mɑ̃/

adverb/ɔ.pi.nja.tʁə.mɑ̃/

doggedly, persistently; stubbornly, obstinately

From opiniâtre + -ment.

opiniâtrement — French Dictionary | Passage