The story
- Latin · derived fromfrangō“to break”
- Medieval Latin · derived fromin-“not”
- Old French · derived frominfrangible
- Middle French · borrowed frominfrangible
- English todayinfrangible
From Middle French infrangible, from Old French infrangible, from Medieval Latin in- (“not”) + frangibilis, from Latin frangō (“to break”).
Words from the same roots
Medieval Latinin- all →
installment
Latinfrangō all →
fret
Etymology from Wiktionary, CC BY-SA 4.0.