IPA: //ʌnˈjʌŋ//
KK: /ʌnˈjʌŋ/
Not being in the early stages of life; older than young.
As she grew older, she felt less and less unyoung.
This word originates from the prefix 'un-' (meaning not) and the root 'young' (from Old English 'geong', meaning youthful or in the early stage of life). The word 'unyoung' means not young or lacking youth.
Think of 'not' ('un-') and 'youthful' ('young') to remember that 'unyoung' refers to something that is not young.