| Singular | Plural | |
|---|---|---|
| Nominativ | planus, plana, planaque, planum | planaque, plana, planae, plani |
| Genitiv | planae, plani, plani | planarum, planorum, planorum |
| Dativ | plano, plano, planae | planis, planisque, planissume |
| Akkusativ | planum, planum, planam | planaque, planas, planasiam, plana, planos |
| Ablativ | plana, plano, plano, planaque | planis, planisque, planissume |
| Vokativ | plana, plane, planecommode, planesentiam, planaque, planum | planaque, plana, planae, plani |
| Singular | Plural | |
|---|---|---|
| Nominativ | planiuscula, planiusculo, planior, planius | planiores, planiora |
| Genitiv | — | — |
| Dativ | — | planioribus |
| Akkusativ | planius, planiorem, planiuscula, planiusculo | planiora, planiores |
| Ablativ | — | planioribus |
| Vokativ | planiuscula, planiusculo, planior, planius | planiora, planiores |
| Singular | Plural | |
|---|---|---|
| Nominativ | planissima | planissima |
| Genitiv | — | — |
| Dativ | planissimo, planissimo | planissimis |
| Akkusativ | — | planissima |
| Ablativ | planissimo, planissimo, planissima | planissimis |
| Vokativ | planissime, planissimeque, planissima | planissima |
| Grundform | |
|---|---|
| Positiv | — |
| Komparativ | — |
| Superlativ | planissime, planissimeque |