Glossy; shiny and smooth — describes surfaces like hair, skin, or fruit that look lustrous and healthy.
毎日のトリートメントで彼女の髪はつやつやになった。
With daily treatments, her hair became glossy.
赤ちゃんの肌はつやつやで触りたくなるほどだ。
A baby's skin is so smooth and glossy you want to touch it.
新鮮なリンゴはつやつやしていて美味しそうに見える。
Fresh apples look delicious because they are shiny.