Unauntly

The “aunt” in this production is devastatingly unauntly, as alarming a specimen as one could wish for.

Source: wiktionary

I’d had several drinks and was watching her light a cigarette, inhale deeply, and blow the smoke out of her mouth and nose simultaneously—and that seemed to flatter her, the way she smoked in such an unauntly manner.

Source: wiktionary

Her petulant sister and the logy Luella never dreamed that Aunt Crete desired such unauntly indulgences.

Source: wiktionary

She became aware very early that Sally had loved her nephew-by-marriage in a very unauntly way, and that in consequence, Mrs Wedgwood would have resented anyone he eventually married.

Source: wiktionary