scalene

The story

1. Ancient Greek · derived fromσκᾰληνός“uneven, unequal”
2. Late Latin · borrowed fromscalēnus“of unequal sides”
3. English todayscalene

Borrowed from Late Latin scalēnus (“of unequal sides”), from Ancient Greek σκᾰληνός (skălēnós, “uneven, unequal”).