Definition of unpromisingness in English:

unpromisingness

Pronunciation /(ˌ)ʌnˈprɒmɪsɪŋnɪs/

noun

  • The fact or quality of being unpromising; lack of promise.

Origin

Mid 17th century; earliest use found in 1st Earl of Orrery (1621–1679), politician and writer. From unpromising + -ness.