IPA: /ʌnˈprəʊpɪʃəs/
KK: /ʌnˈproʊpɪʃəs/
Not favorable or likely to lead to success; often used to describe situations or conditions that are not promising.
The weather was unpropitious for our picnic, so we decided to stay indoors.
Unpropitious → It is formed from "un-" (meaning not) and "propitius" (from Latin, meaning favorable or advantageous). The word "unpropitious" means not favorable or not advantageous, indicating an unfavorable condition or situation.
Think of 'not' ('un-') being combined with 'favorable' ('propitius') to remember that 'unpropitious' describes something that is not favorable.