genial

Etymology 1

From Middle French génial, from Latin geniālis (“of or pertaining to marriage; festive, genial”), from genius (“guardian spirit”) + -ālis.

adj

1. Friendly and cheerful.
2. (especially of weather) Pleasantly mild and warm.
3. Marked by genius.
   Men of genius have so often attacht the highest value to their less genial works.
   About fifty years later, in 1675, the Danish astronomer Ole Roemer (1644-1710) had the genial idea of using astronomical rather than terrestrial distances. 2003, Laura Fermi, Gilberto Bernardini, Galileo and the Scientific Revolution, Courier Dover Publications, page 111
4. (archaic) Contributing to, or concerned in, propagation or production; generative; procreative; productive.
5. (obsolete) Belonging to one's genius or natural character; native; natural; inborn.

Etymology 2

From Ancient Greek γένειον (géneion, “chin”) + -al.

adj

1. (anatomy) Relating to the chin; genian.