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Explanation: It depends what "It" is. If you are talking about a situation, I would use horrible. If you are talking about something has gone rotten, like an egg, I would use puri. If you mean weather, I would use the first answer proposed here ("Il a fait mauvais.").
More specifics would be needed for an accurate translation, but I hope this helps!
Native speaker of:
32 mins confidence:
c'a été mauvais
Explanation: "was" in passé composé is "a été" in third person singular
However, I agree with previous answer that more context is necessary to ensure a proper translation.