Definition of unprevailing in English:

unprevailing

Pronunciation /ˌʌnprɪˈveɪlɪŋ/

adjective

  • 1Not superior or victorious; ineffective, unsuccessful.

  • 2rare Not prevalent or usual.

Origin

Early 17th century; earliest use found in William Shakespeare (1564–1616), playwright and poet. From un- + prevailing.