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Webster 1913 Edition

Adj.

Having the character of a child; belonging, or appropriate, to a child.

Gower.

adv.

Like a child.

Mrs. Browning.

Adj.

Like a child.

childly ‎(comparative more childly, superlative most childly)

Of or pertaining to a young child; childlike
(Can we find and add a quotation of Gower to this entry?)

Childly has a positive connotation, as opposed to the sometimes pejorative childish.