For all adjectives—both i-adjectives and na-adjecitves—we can turn them into nouns with the particle さ.
For i-adjectives we replace い and さ.
| 悲しい [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 悲しさ |
| Sad [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Sadness |
| 楽しい [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 楽しさ |
| Enjoyable [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] amusement |
| 高い [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 高さ |
| Tall [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Height |
| 難しい [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 難しさ |
| Difficult [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Difficulty |
| 辛い [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 辛さ |
| Hot/spicy [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Spiciness/Hotness |
For na-adjectives we add さ.
| 複雑 [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 複雑さ |
| Complex [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Complexity |
| 透明 [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 透明さ |
| Transparent [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Clearness |
| 便利 [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 便利さ |
| Convenient [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Convenience |
| 大切 [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] 大切さ |
| Important [mks_icon icon=”fa-long-arrow-right” color=”#000000″ type=”fa”] Importance |
| このビルの高さは２５０メートルです。 |
| The height of this building in 250 meters. |
| 挑戦してみれば試験の難しさがわかる。 |
| If you give it a try you’ll understand the difficulty of the exam. |
For a limited number of i-adjectives we can also create a noun with the particle み. Unfortunately, there is no set rule as to which i-adjectives can be nominalized with this particle but some of the most commonly heard are given below.