IPA: /ʌnˈprɒmɪsɪŋli/
KK: /ʌnˈprɑːmɪsɪŋli/
In a way that does not show signs of success or improvement.
The project was progressing unpromisingly, leading the team to reconsider their approach.
Unpromisingly → It is formed from "un-" (meaning not) and "promising" (from Latin "promittere", meaning to send forth or promise) and the suffix "-ly" (meaning in a manner). The word "unpromisingly" means in a manner that does not show promise or potential.
Think of 'not' ('un-') showing 'promise' — that's why unpromisingly means in a way that lacks promise.