The Japanese language is very flexible with adjectives. The sa-form allows to use an i-adjective as a noun or in other words to add ~ness to it (e.g. useful => usefulness, powerful => powerfulness, etc.)
It is very easy to build. Just replace “i” at the end of the word with a “sa”. So 楽しい (tanoshii, enjoyable) becomes joy as 楽しさ (tanoshisa). Here are a few more examples to make it clear.
| Plain Form | Romaji | Meaning | sa Form | Romaji | Meaning |
| 楽しい | tanoshii | enjoyable | 楽しさ | tanoshisa | joy |
| 美しい | utsukushii | beautiful | 美しさ | utsukushisa | beauty |
| 新しい | atarashii | new | 新しさ | atarashisa | newness |
| 赤い | akai | red | 赤さ | akasa | redness |
| 大きい | ookii | big | 大きさ | ookisa | size, dimensions |
Example sentences:
日本のお寺の美しさが好きです。
nihon no otera no utsukushisa ga suki desu.
I like the beauty of Japanese temples.
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… almost forgot, … remember again… thanks
Hey!ありがとう!i’m curious for the さfor a long time… 今私got it~