certus: all forms
certus means “certain, sure; fixed”. Below is its full declension in Latin.
Positive
Positive, singular | Masculine | Feminine | Neuter | Forms |
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| Nominative | certus | certa | certum | |
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| Genitive | certi | certae | certi | |
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| Dative | certo | certae | certo | |
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| Accusative | certum | certam | certum | |
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| Ablative | certo | certa | certo | |
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| Vocative | certe | certa | certum | |
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Positive, plural | Masculine | Feminine | Neuter | Forms |
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| Nominative | certi | certae | certa | |
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| Genitive | certorum | certarum | certorum | |
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| Dative | | | | certis |
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| Accusative | certos | certas | certa | |
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| Ablative | | | | certis |
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| Vocative | certi | certae | certa | |
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Comparative
Comparative, singular | Neuter | Forms |
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| Nominative | certius | certior |
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| Genitive | certioris | certioris |
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| Dative | | certiori |
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| Accusative | certius | certiorem |
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| Ablative | | certiore · certiori |
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| Vocative | certius | certior |
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Comparative, plural | Neuter | Forms |
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| Nominative | certiora | certiores |
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| Genitive | | certiorum |
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| Dative | | certioribus |
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| Accusative | certiora | certiores |
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| Ablative | | certioribus |
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| Vocative | certiora | certiores |
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Superlative
Superlative, singular | Masculine | Feminine | Neuter | Forms |
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| Nominative | certissimus | certissima | certissimum | |
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| Genitive | certissimi | certissimae | certissimi | |
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| Dative | certissimo | certissimae | certissimo | |
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| Accusative | certissimum | certissimam | certissimum | |
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| Ablative | certissimo | certissima | certissimo | |
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| Vocative | certissime | certissima | certissimum | |
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Superlative, plural | Masculine | Feminine | Neuter | Forms |
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| Nominative | certissimi | certissimae | certissima | |
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| Genitive | certissimorum | certissimarum | certissimorum | |
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| Dative | | | | certissimis |
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| Accusative | certissimos | certissimas | certissima | |
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| Ablative | | | | certissimis |
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| Vocative | certissimi | certissimae | certissima | |
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Meaning and examples of certus
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.