A noun/suffix meaning '-ness' or '-likeness'; it expresses the characteristic quality, essence, or typical features of someone or something.
子どもらしさを残して遊ぶ時間を大切にしたい。
I want to value playtime that preserves children's childlike qualities.
伝統的な日本らしさを感じられる街並みだった。
It was a streetscape where I could feel the traditional Japanese-ness.
彼女の話し方には大人らしさと若々しさの両方がある。
Her manner of speaking has both a grown-up quality and youthfulness.
デザインのらしさを保ちながら機能性を高めるのが課題だ。
The challenge is to enhance functionality while preserving the design's characteristic qualities.