IPA: /ʌnˈfeɪvərəbləs/
KK: /ʌnˈfeɪvərəbəl/
The quality or state of being disadvantageous or not favorable.
The unfavorableness of the weather affected our plans for the picnic.
Unfavorableness → It is formed from "un-" (meaning not) and "favorable" (from Latin "favorabilis", meaning to be favored or advantageous) and the suffix "-ness" (meaning the state or quality of). The word "unfavorableness" means the state of not being favored or advantageous.
Think of 'not' ('un-') being combined with 'favorable' to remember that 'unfavorableness' refers to a situation that is not advantageous.