い-Adj(-い)+さ / な-Adj(-な)+さ-ness (nominalizing suffix)
Turns adjectives into nouns to express measurable degree or state. Remove い from い-adjectives (高い → 高さ) or な from な-adjectives (静かな → 静かさ) and add さ.
Common mistakes
- Confusing with ~み which expresses subjective state/flavor
- Leaving the い or な attached to the adjective
- Using the pattern with verbs instead of adjectives