This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Lacking adult maturity or experience; immature: a callow young man.

adj. Bald.

adj. Unfledged (of a young bird).

adj. Immature, lacking in life experience.

adj. Lacking color or firmness (of some kinds of insects or other arthropods, such as spiders, just after ecdysis). Teneral.

adj. Shallow or weak-willed.

adj. Unburnt (of a brick)

n. A callow young bird.

n. A callow or teneral phase of an insect or other arthropod, typically shortly after ecdysis, while the skin still is hardening, the colours have not yet become stable, and as a rule, before the animal is able to move effectively.

adj. Destitute of feathers; naked; unfledged.

adj. Immature; boyish; “green”.

n. A kind of duck. See old squaw.

Bald; without hair.

Without feathers; that has not yet put forth feathers; naked; unfledged, as a young bird: as, “callow young,”

Pertaining to an unfledged bird: as, “callow down,” Drayton, The Owl.

Youthful; juvenile; very immature: as, a callow youth.

n. A bald person; a baldhead.

n. An alluvial flat along a river-course: a term used by writers on Irish geology and agriculture.

n. In coal-mining, the baring, or cover, of open workings.

Having the character of an alluvial flat: as, callow land; a callow meadow.

n. In entomology, an insect just emerged from its cocoon: especially applied to ants.

adj. young and inexperienced

"(Being a new anonymous:) I have nothing at all to say about Kate DiCamillo as a person, but agree that her work is often heavy-handed, condescending, uninteresting, and just plain callow."

inexperient    inexperienced   

old squaw   

naked    unfledged    immature    boyish    “green    featherless    inexperienced   

Gallo    ballow    balow    cavallo    gallow    hallow    mallow    palo    shallow    tallow   

half-grown    motherless    tow-headed    curly-haired    croquette    bright-faced    shock-headed    fresh-faced    unthankful    semi-royal