perfidus, perfida, perfidum:
Adjective · 1st declension · variant: 1st · comparison: positive
- Frequency:
- Frequent
faithless, treacherous, false, deceitful;
Inflections
positive
masculine
| Case | Singular | Plural |
|---|---|---|
| Nom. | perfidus | perfidi |
| Gen. | perfidi | perfidorum |
| Dat. | perfido | — |
| Acc. | perfidum | perfidos |
| Voc. | perfide | perfidi |
| Abl. | perfido | — |
feminine
| Case | Singular | Plural |
|---|---|---|
| Nom. | perfida | perfidae |
| Gen. | perfidae | perfidarum |
| Dat. | perfidae | — |
| Acc. | perfidam | perfidas |
| Voc. | perfida | perfidae |
| Abl. | perfida | — |
neuter
| Case | Singular | Plural |
|---|---|---|
| Nom. | perfidum | perfida |
| Gen. | perfidi | perfidorum |
| Dat. | perfido | — |
| Acc. | perfidum | perfida |
| Voc. | perfidum | perfida |
| Abl. | perfido | — |
Examples
de Spectaculis
Marcus Valerius Martialis (Martial) from EPIGRAMMATON LIBRI
"...pila taurus erat! X Laeserat ingrato leo perfidus ore magistrum, ausus tam notas contemerare manus, sed dignas tanto..."- L
Liber II
Lucius Annaeus Seneca (Seneca the Younger) from DE IRA
"...aspici non uult; et fidei acerrimus exactor est perfidus, et mendacia persequitur ipse periurus, et litem sibi inferri..." - L
Thyestes
Lucius Annaeus Seneca (Seneca the Younger) from FABULAE
"...facinus ingens ausus assumpta in scelus consorte nostri perfidus thalami auehit. Hinc omne cladis mutuae fluxit malum..." 
Liber Septimus
Gaius Valerius Flaccus from ARGONAVTICA
"...Iphis aut Scythiae tanta inde manus? iussisset abire perfidus atque suis extemplo cedere regnis. spem mihi promissam..."Liber Sextus
Gaius Valerius Flaccus from ARGONAVTICA
"...opem, funesta priusquam consilia ac saevas aperit rex perfidus iras. increpat et seris Vulcanum maesta querellis, cuius flammiferos..."
Liber Tertius
Publius Papinius Statius from THEBAID
"...Aoniae moderator perfidus aulae nocte sub ancipiti, quamuis umentibus astris longus ad auroram superet labor, otia somni accipit..."- P
Aeneid XII
P. Vergilius Maro (Vergil) from The Aeneid
"...exclamant Troes trepidique Latini, arrectaeque amborum acies. at perfidus ensis frangitur in medioque ardentem deserit ictu, ni fuga..." - D
Satura XIII
Decimus Iunius Iuvenalis (Juvenal) from SATVRAE
"...uideris uno flagitio? dabit in laqueum uestigia noster perfidus et nigri patietur carceris uncum aut maris Aegaei rupem..."