Definition of unpostponable in English:

unpostponable

adjective

  • That cannot be postponed.

Pronunciation

unpostponable

/(ˌ)ʌnpəˈspəʊnəbl/ /(ˌ)ʌnˌpəʊs(t)ˈpəʊnəbl/

Origin

Early 19th century; earliest use found in True Briton. From un- + postponable.