unparentaladj.
/(ˌ)ʌnpəˈrɛntl/, U.S. /ˌənpəˈrɛn(t)l/ Not characteristic of or resembling a parent or parents; not fatherly or motherly.
ΚΠ
1718 T. Oade Unnatural Parent 56 These, not only unparental, but even inhuman and unnatural Proceedings.
1785 E. K. Mathews Constance IV. xxviii. 250 His deportment..shewed..a far greater degree of filial attachment than so unparental a father could claim.
1838 J. H. St. Aubyn Elopement I. xxvi. 274 My father's conduct to me was harsh, unjust, unparental, and injudicious.
1896 W. Hayward James Hall II. vii. 98 These unparental parents should be made to pay for the support of their children.
1927 W. L. Myers Later Realism iii. 63 There is something essentially unparental in the characters of Mary's father and mother.
1995 Guardian 19 Aug. (Weekend Suppl.) 16/4 He always gave the most unparental advice—don't get a job, go on the stage.
This is a new entry (OED Third Edition, December 2014; most recently modified version published online December 2021).
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adj.1718