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