IPA: /ʌnˈfeɪvərəbl/
KK: /ʌnˈfeɪvərəbəl/
Not good or positive; likely to cause problems or difficulties.
The weather conditions were unfavorable for the outdoor event.
Unfavorable → It is formed from "un-" (meaning not) and "favorable" (from Latin "favorem", meaning favor or goodwill). The word "unfavorable" means not showing favor or goodwill, indicating a negative condition or situation.
Think of 'not' ('un-') being combined with 'favor' ('favorem') to remember that 'unfavorable' describes a situation that does not show support or goodwill.