YOU SAID:

i have a massive headache

INTO JAPANESE

私はひどい頭痛を持っています

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i have a terrible headache

INTO JAPANESE

激しい頭痛がする

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have a severe headache

INTO JAPANESE

頭痛がひどい

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have a bad headache

INTO JAPANESE

頭が悪い

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stupid

INTO JAPANESE

バカ

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fool

INTO JAPANESE

バカ

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fool