traîtreusement

== French == === Etymology === From traîtreux +‎ -ment. === Pronunciation === IPA(key): /tʁɛ.tʁøz.mɑ̃/ ~ /tʁe.tʁøz.mɑ̃/ === Adverb === traîtreusement treacherously === Further reading === “traîtreusement”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012