adverb/fɔʁ.mɛl.mɑ̃/
formally, in terms of form; strictly, absolutely
“1908, Gaston Leroux, Le Mystère de la chambre jaune, 2009 ed., Wikisource, chap. 1; translated 1908 by anonymous, Margaret Jull Costa (ed.), as The Mystery of the Yellow Room, 2003 ed., Dedalus” — — Up until now he had so firmly opposed my doing so that I had given up hope of ever being able to publish the most extraordinary detective story of the past fifteen years.
From formel + -ment.