unchild

Definitions

To bereave of children; make childless.
To divest of the character of a child in relation to parents. [Rare in both uses.]

transitive verb To bereave of children; to make childless.
transitive verb To make unlike a child; to divest of the characteristics of a child.

un- +‎ child

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The family consists of a grown-up son, a shiftless, melancholy-looking youth, who possibly pines for a wider life; a girl of sixteen, a sour, repellent-looking creature, with as much manners as a pig; and three hard, unchild-like younger children.

A Lady's Life in the Rocky Mountains 2007
He had been living so unchild-like a life of late that Janetta begged to keep him for play as well as for lessons with other children.

A True Friend A Novel Adeline Sergeant
Ever since he had found his place in his father's heart, the drooping unchild-like sadness had passed away, and though still grave and thoughtful, there was a life and animation about him at times that cheered and delighted her.

Heartsease, Or, the Brother's Wife Charlotte Mary Yonge 1862
Conformably to the law of the fifth commandment, children ought not to marry, nor to move towards marrying, without the advice and consent of their parents; those that do (as bishop Hall here expresses it) wilfully unchild themselves, and exchange natural affections for violent. parents have a property in their children as parts of themselves.

Commentary on the Whole Bible Volume II (Joshua to Esther) 1721
If they command against God, they lose their right of being obeyed, and in this case we must unchild ourselves.

The Ten Commandments 1692