IPA: //ʌnˈprɒspərəs//
KK: /ʌnˈprɑːspərəs/
Not successful or wealthy; lacking in prosperity.
The unprosperous town struggled to attract new businesses.
Unprosperous → It is formed from "un-" (meaning not) and "prosperous" (from Latin "prosperus", meaning favorable or fortunate). The word "unprosperous" means not favorable or fortunate, indicating a lack of success or wealth.
Think of 'not' ('un-') being added to 'favorable' or 'fortunate' ('prosperous') — this helps you remember that unprosperous means lacking success or good fortune.