Note
actually this can also mean, and even would most of the times:
the pizza is spoiled.
When comes to food, we would rather say schmeckt nicht (gut), meaning doesn't taste good
The word gut is optional in the German sentence.
Breakdown of Die Pizza ist schlecht.
schlecht
bad; unwell
die Pizza
the pizza
no discussion about feminism here...but our Pizza is feminine.
Btw. you might have noticed by now, that we start all our nouns with a capital letter.
ist
is
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