physically heavy; having considerable weight. A casual/colloquial form of 重い.
この箱は思ったより重たいから二人で運ぼう。
This box is heavier than I thought, so let's carry it together.
朝から肩が重たくて眠れなかった。
My shoulders have felt heavy since this morning and I couldn't sleep.
荷物が重たいのでエレベーターを使った。
Because the luggage was heavy, I used the elevator.
heavy (feeling, atmosphere); serious; gloomy or oppressive — describing mood, atmosphere, or emotional weight.
会議は重要な発表のせいで重たい雰囲気になった。
The meeting became heavy/tense because of the important announcement.
彼の言葉はいつもどこか重たくて話しにくい。
His words always feel somewhat heavy, making it hard to talk to him.
空気が重たいので、外で少し歩こうか。
The atmosphere feels oppressive — shall we walk outside for a bit?