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How did 優しさ derived from 優しい? The rule is?

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優し

The suffix (接尾辞)「さ」, attached to the stem (語幹) of i-adjectives and na-adjectives, turns them into the noun form, like this:

i-adjective おおきい "big" - stem おおき + suffix さ → おおきさ "size"
na-adjective にぎやかな "lively" - stem にぎやか + suffix さ → にぎやかさ "liveliness"

A few more examples:

i-adjectives:
かわいい "cute" → かわいさ "cuteness"
[長]{なが}い "long" → 長さ "length"
[明]{あか}るい "bright" → 明るさ "brightness"

na-adjectives:
きれいな "clean" → きれいさ "cleanness"
[華]{はな}やかな "brilliant" → 華やかさ "brilliance"
[便利]{べんり}な "convenient" → 便利さ "convenience"

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  • Got it clearly now. Thx a lot. – Bruce Wu Feb 20 at 8:08

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