inflative

The story

1. Medieval Latin · derived fromīnflātīvus
2. Middle English · inherited frominflātīve“causing swelling; producing wind”
3. English todayinflative

From Middle English inflātīve (“causing swelling; producing wind”), from Medieval Latin īnflātīvus, from īnflō (“to inflate; to blow into”). Compare the obsolete French adjective inflatif, inflative.