It's Merriam-Webster's Word of the Day for September 13th.
Today's word is callow, spelled C-A-L-L-O-W.
Callow is an adjective.
It's a synonym of the word immature.
used to describe someone, especially a young person,
who doesn't have much experience and doesn't know how to behave like an adult.
Like the word immature, Callow is often used disapprovingly.
Here's the word used in a sentence from Ars Technica by Jennifer Wollett.
Lowry opted to make Gowan a callow young man who aspires to earn the right to join the Knights of the Round Table by proving his honor and bravery,
confronting some hard truths about himself along his journey.
Although callow birds, that is featherless baby birds,
are quite visibly and audibly hungry for the world beyond their nest,
they're just as visibly immature, far from ready to step or hop into it.
This meaning of calo isn't common.
We only define the word this way in our unabridged dictionary.
But it both links the word directly to its origin, the old English word caloo,
meaning bald, and to today's more common use in describing someone possessed of youthful naivete.
Calu eventually fledged into Calo with the same bald hairless meaning, but was applied to bald land,
too, that is, land denuded of vegetation or not producing it in the first place.
In the 16th century,