Physically heavy; weighty — having considerable weight and not easy to carry (colloquial variant of 重たい).
この箱は重ったいから、二人で持とう。
This box is heavy, so let's carry it together.
古い本は重ったく感じることがある。
Old books can sometimes feel heavy.
Having a heavy or gloomy feeling/atmosphere; serious or depressing in tone (same as 重たい).
会議の雰囲気が重ったくて、誰も発言しなかった。
The meeting atmosphere was heavy, and no one spoke up.
彼の表情が重ったく見えたので、声をかけた。
His expression looked heavy, so I called out to him.