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How-to turn ADJECTIVES into NOUNS (Stem-Form ADJECTIVE + さ)

How-to turn ADJECTIVES into NOUNS (Stem-Form ADJECTIVE + さ)

To turn an adjective into a noun, simply add the suffix さ right after the Stem-Form of the adjective. For い-Adjectives, this means dropping the final い character at the end of the word and replacing it with character さ. For な-Adjectives, this means simply adding the character さ right after the word itself, because な-Adjectives are inherently in their Stem Form. This grammatical process is very similar to the English usage of suffixes such as “ness,” “ity,”ence,” etc.

Example(s):

美味しい (おいしい) = 美味し (おいしさ)
oishii = oishisa
重い (おもい) = 重 (おもさ)
omoi = omosa
楽しいい (たのしい) = 楽し (たのしさ)
tanoshii = tanoshisa
長い (ながい) = 長 (ながさ)
nagai = nagasa

綺麗 (きれい) = 綺麗 (きれいさ)
kirei = kireisa
便利 (べんり) = 便利 (べんりさ)
benri = benrisa
真面目 (まじめ) = 真面目 (まじめさ)
majime = majimesa
有名 (ゆうめい) = 有名 (ゆうめいさ)
yuumei = yuumeisa

来週の試験の難しさは先生次第です。
Raishuu no shiken no muzukashisa wa sensei shidai desu.
(How hard next week’s test is going to be depends on our teacher.)

この図書館の静かさが大好きです。
Kono toshokan no shizukasa ga daisuki desu.
(I just love the quietness of this library.)