Where does “unflammable” come from?

unflammable (English) comes from English flammable, from English inflammable, from Middle French inflammable, from Medieval Latin inflammabilis, from Latin īnflammāre.

unflammable (English): Not flammable

Definitions

  1. Not flammable

Ancestry of “unflammable”, step by step

unflammable traces back through two separate lines of ancestry.

via English flammable

StepLanguageWordMeaning
1EnglishflammableCapable of burning, especially a liquid; Easily...
2EnglishinflammableCapable of burning; easily set on fire; Easily...
3Middle Frenchinflammable
4Medieval Latininflammabilisinflammable
5Latinīnflammāre

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Latin īnflammāreEvery word from Medieval Latin inflammabilisEvery word from Middle French inflammable
unflammable — Etymology, Origin & Word History | Etymology Explorer