IPA: //ʌnˈprɒmɪsɪŋ//
KK: /ʌnˈprɑːmɪsɪŋ/
Not likely to succeed or improve; showing little hope for a positive outcome.
The project had an unpromising start, making everyone doubt its success.
Comparative: more unpromising
Superlative: most unpromising
Unpromising → It is formed from "un-" (meaning not) and "promising" (from Latin "promittere", meaning to send forth or promise). The word "unpromising" means not showing signs of promise or potential.
Think of 'not' ('un-') showing 'promise' — that's why unpromising means lacking potential.