This is the 1333rd most frequent Arabic word.
أسوأ
"أسوأ" means "worst."
In this sentence, 'أسوأ' is used as an adjective modifying 'يوم' (day) to indicate the least favorable or most negative quality of the day.
هذا هو أسوأ يوم مررت به.
This is the worst day I've ever had.
Here, 'أسوأ' acts as an adjective in a comparative structure, referring to the quality of the weather being less favorable relative to expectations.
الطقس اليوم أسوأ مما كنت أتوقع.
The weather today is worse than I expected.
'أسوأ' is utilized as an adjective describing 'خيار' (option), specifying it as the least favorable among available choices.