incredible

The story

1. Latin · derived fromincrēdibilis“that cannot be believed”
2. Middle English · inherited fromincredible
3. English todayincredible

From Middle English incredible, from Latin incrēdibilis (“that cannot be believed”), from in- (“not”) + crēdibilis (“worthy of belief”), from crēdō (“believe”), equivalent to in- + credible.

First known use, by meaning

• from 15th c. Too implausible to be credible; beyond belief.