This is the 7246th most frequent Japanese word.
不味かっ
"不味かった" means "was unappetizing" or "tasted bad."
In this sentence, '不味かった' (mazukatta) is used to directly describe the food as having an unpleasant taste.
このスープは不味かったです。
This soup tasted bad.
Here, '不味かった' (mazukatta) is used to explain the reason for the action of leaving the snacks uneaten due to their bad taste.
お菓子が不味かったので、残しました。
I left the snacks uneaten because they tasted bad.
In this case, '不味かった' (mazukatta) is used to describe the drink in a preceding time frame as having disliked taste, setting a context for retrying it.